What are the symptoms of a failed blower motor resistor?

Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

What does it mean if your blower motor is not working?

Average rating from 849 customers who received a AC is not working Inspection. The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

Where is the blower motor resistor on a Mazda 5?

In many cars it’s fairly easy; the blower motor is located behind the glove box and held by 3-4 screws. In others it might be located inside the dash (e;g Mazda 5) which makes replacement difficult. If you need a proper diagnostic procedure, we posted several links where you can access a service manual for your car for a subscription fee.

What happens when a heater motor resistor fails?

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored. 2. Blower motor does not work on certain settings

Why is my Chevy Malibu heater not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My Heater Working? What are common reasons my Chevrolet Malibu has heater problems?

How much does it cost to replace a blower motor resistor?

The blower motor resistor or control module replacement is not very expensive. For example, one of our colleagues had a problem with his 2011 Ford Escape: the fan only worked at the speed 4. He paid $50 to diagnose and $112 to replace the resistor at a local Ford dealership.

Can a blower motor relay be a problem?

One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents.

How does a blower motor resistor control the fan speed?

The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.

Can a broken motor switch stop a blower?

A broken blower motor switch can also stop the blower from changing to certain speed settings. If your blower motor cannot change to certain speeds, check both the resistor and the switch on your dashboard. The most common failure points are the resistor and the motor itself.

How much does a blower motor resistor cost?

Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. The replacement parts come in individual units, sets of two resistors, or as part of a blower motor resistor kit.

What is the purpose of a blower motor resistor?

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.

What are the symptoms of a bad blower motor resistor?

Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Blower motor does not work on certain settings. No air from the vehicle’s vents.

What does a blower motor resistor do?

Definition. A blower motor resistor, typically located beneath the passenger side dashboard, contains three resistors, or sets of terminals designed to generate voltage in proportion to electrical current. These resistors allow the blower motor to function at lower speeds.

Why does blower motor resistor keep going out?

The blower motor appears to be defective here. When the brushes wear out the motor draws excessive amps which could cause the resistor to burn out. Before making further replacements remove the motor and check it, especially the brush assembly. This is the most likely reason for the resistor to fail repetitively.

Where to check the blower motor relay on a Chevy?

Thankfully, it is fairly simple to tell if the relay is malfunctioning and to install a replacement. The blower motor relay is located in the under hood power distribution center and is simply labeled “Blower.” It will only take a few minutes to inspect and replace the relay if necessary. Open the hood of your Chevrolet vehicle.

How to replace the blower motor resistor on a Chevy Silverado?

In this video we show you how to replace the blower motor resistor in a Chevy Silverado, Also it is very important to consider the blower motor anytime a resistor fails. A worn out blower motor may still work, however it will require more amperage to operate, this extra amperage is pulled through the resistor and can easily burn it out. Loading…

Why is the resistor not working on my blower?

Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

Why does my AC blower motor not work?

The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently.

How to test Honda Accord blower motor resistor?

Testing Honda power transistor (blower motor control module). For example, in the 2009 Honda Accord, the service manual describes the procedure as follows: Turn the ignition to ON. Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times.

Where does the power transistor go in a blower motor?

The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor. The service manual advises measuring the voltage at the blower motor, then if not OK, at the power transistor and so on.

What happens when a blower motor resistor fails?

If you’ve replaced a blower motor resistor and that replacement has failed, it’s time to conduct an amperage test on the blower motor. If the amp draw exceeds manufacturer’s specifications, replace the blower motor. can also cause an overheating condition. In some cases, the heat is so high that it melts the connector.

Where does the power go in a blower motor?

For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.

What to do if your blower resistor Burns?

Look for obvious signs of corrosion and burns from overheating. If you see signs of overheated connectors, replace the blower resistor and its connector, but again, you must splice the wires right, or you’ll have problems at the splice later on.

When did the blower motor on my Blazer stop working?

2005 T’Blazer, 6 cylinder, manual A/C controls. Maybe 6 months ago, blower fan speed 5 stopped working, followed by the rest shortly after. Following the great advice on this forum, I checked the blower motor resistor and plug, and replaced as advised.

Why does my Dakota blower resistor keep going bad?

When your Dakota or Durango left the factory, it had a Mopar motor and voltage resister that were compatible with each other. After 10-15 years the motor wears out , begins to draws more amps burns up the resister. Most people replace the wiring harness and the resister with. cheap replacement from Autozone / Advanced etc.

Why is my blower motor stuck on one speed?

Blower motor stuck on one speed A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings.

What happens if you have a bad blower motor?

The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.

Why does my a / C front blower stop working?

No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. A/C system can be turned off and on multiple times, but the front blower fails to respond.

Is the front blower on my win still working?

It’s been about six weeks since we replaced the WIN. To clarify, the rear blower always works. The front blower will come on and, if its going to quit, it will cycle off, back on and then off until I restart the van. It has quit at every speed-no one speed more than any other.

What causes a blower motor to stop working?

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

How does a half speed blower motor work?

So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor.

How are the resistors arranged in a blower motor?

Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Blower resistors can burn out. When that happens, you lose that speed.

Why does my blower motor make a squealing noise?

The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds.

How to test a blower motor resistor in the garage?

Look for obvious signs of corrosion and burns from overheating. If you want to do a quick test of the blower resistor, you can check the resistance of each of the resistors with a multimeter as follows: set the tool to read ohms (a measurement of resistance) and connect one of its probes to the common output terminal of the resistor.

How is the speed of the blower motor controlled?

The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.

How does the speed of a blower motor work?

This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

What does a heater blower resistor do?

Over the last ten years or so, motor manufacturers have introduced more sophisticated Heater Blower Resistors to control the blower fan motor for the heater and, on many, the digital aircon too. The Heater Resistor is also known as the Resistor Pack or Rheostat. which is designed to keep the internal electronics cool and working efficiently.

What to do if rear blower is not working?

They wired the blower motor resistors after the motor, then comes the rear speed control then ground. Check for 12v at the YE/RD wire in CJB at fuse 7, then the G200 ground. If nothing then the aux relay.

What are the symptoms of a bad heater motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.

The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

What causes a blower motor to not work?

If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be.

Can a blown fuse cause a blower fan not to work?

Solution: This can be as simple as a blown fuse, it could be a wiring issue, or the blower fan could need replacement. You can check to see if the fuse is blown and replace it, but your mechanic will likely need to intervene if it’s more complicated than that.

Why does my heater not work on high speed?

Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.

What kind of blower does not work on high?

1997 GMC C1500 Heater/AC Blower Will Not Work on HIGH. 1997 GMC C1500 Heater/AC blower will not work on HIGH. I have replaced the black BOSCH relay behind the glovebox, the blower RESISTOR and the blower MOTOR and still cannot get the blower to work on HIGH.

What to do when your heater fan is not blowing?

The fan should be blowing on high, now wiggle the connector one more time the fan should stay on without interruption. Now put that foam covering back on just the way you found it. Push the wiring back in like you found it and then put you glove box back in.

Why is my blower motor not coming on?

With the back wire hooked up I ran a jumper directly to the battery pos and attached it the purple wire terminal on the motor. The motor did not come on. So either my motor is dead shorted or something has gummed up the brushes or they are worn out.

Where can I get a new blower motor resistor?

I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). I’ve checked the fuse in the dash fuse panel and it is good.

Where is the relay on a blower motor?

Correction assuming 97 is same (probably is)… Fan relay is as posted before on top of the duct work left of the resistors you can see both behind the glove box if you take it out. The purple wire comes from the relay/resistors according to fan speed selected.

Where does the purple wire come from on a blower motor?

The purple wire comes from the relay/resistors according to fan speed selected. The purple wire should have battery voltage ~ 12V when on hi. At low is might have 5V, M1 7 ish, and M2 9 ish volts. (note mine is not working and I think resistors are bad I get 11.9V on hi 11.73 v on all other speeds lo, m1, and m2.

What happens when the yellow light goes out on a blower motor?

If the yellow light stays on, then you have a problem in the ground circuit which is either item 2 or 3 above. If the light goes out in position 0, your ground circuit is OK and your failure is item 4, 5, or 6 above. Since you have already swapped item 4 and 5 then it must be item 6 that is failing.

What causes a blower motor to go bad?

There are three main failures that happen in the blower motor circuit. 1. The contact (s) on the resistor pack burn open or become intermittent. 2. The Splice Pack mounting tab located on the passenger side inner fender gets corroded or rusted. 3.

How to tell if a Chevy Colorado blower is not a resistor?

Open the connector (separate the two halves, the male and the female connector ends). Look carefully to see if they look loose to you,.. like take the butt of a small drill bit and see if the ends of the pins are all loosy-goosy….

What should the ground voltage be on a Chevy Colorado blower?

You should always have 12 volts at the brown wire of the blower connector. You won’t get 12 volts by metering the brown and orange leads, if the ground is defective. There aren’t any HVAC grounds in the ground point on the left side. The compressor ground is G103, on the engine block.

How to easily get your cars blower motor working again?

If playback doesn’t begin shortly, try restarting your device. My number one goal is to help you save money on your automotive repairs. Automotive Repair Videos for the do it your self-er to Master Mechanic or the flat rate mechanics (DIY) trying to trim a little time off there repairs. These videos are for everyone.

When do you need to replace the blower motor relay?

If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

What happens when a blower motor relay wears out?

Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.

How to replace a blower motor resistor thermal fuse?

Blower Motor Resistor Thermal Fuse Replacement 1 Order the Correct Fuse. The part I ordered is from NTE Electronics. 2 Remove Old Fuse. Now the instructions say to use the crimps and only make mechanical connections. 3 Continue Removal. 4 Tin. 5 Solder the Crimps. 6 Add the Fuse. 7 Rinse and Repeat. 8 Another Shot

Where is the blower motor resistor located on a Ford Escape?

In the 2008-2011 Ford Escape, the resistor is located behind the glove box on top of the HVAC unit air duct. It’s held by two screws and is easy to replace. See the photo. In the 2008-2011 Ford F150 the blower motor resistor is also located behind the glove box, but is installed in the right side of the plastic air duct.

How does a blower motor resistor pack work?

The way the resistor pack does this is by shortening or lengthening the circuit through the coils to add or subtract the amount of resistance it takes to get the speed you want. So naturally, three speeds, four pins.

Where is the blower motor relay on a F53?

Posted By: C-Leigh Racing on 03/31/10 08:30pm I’ve found the blower motor relay, its in another fuse box outside under the hood. If I understand a relay, it is for operating the high speed side of the fan.

Why is the blower motor relay not working?

As I understand things – the blower motor relay acts as a switch completing the electrical circuit between the battery, your fan switch, the resistor and the blower motor. It operates when both the ignition switch and fan switch are in the on position. When this relay goes toes up – then nothing on the circuit gets power.

What to do if your blower motor relay is failing?

For this reason, if you suspect that your blower motor relay is having a problem, have the vehicle’s AC system diagnosed by a professional technician from YourMechanic. They will be able to determine if the car will need a blower motor relay replacement, or a different repair, to bring full functionality back to your AC system.

When did General Motors start making blower motor problems?

On General Motors vehicles built in the 2000 decade it’s not always an actuator problem. Therefore it will be necessary to perform some diagnosis. This is one scenario where the dealership has a diagnostic tool that can make quick work of pinpointing the root cause.

What are the symptoms of blower motor failure?

Lack of air from the vehicle’s vents
Stuck on specific settings
Stuck at one speed

What happens if blower motor fan fails?

A blower motor without power will not be able to produce any air pressure , and as a result the heating and air conditioning system will be left with no air coming from the vents. As the blower motor resistor is the component directly responsible for powering the blower motor, when it fails it major issues with the blower motor and the heating and air conditioning system can be experienced.

Is my blower motor bad?

No air from the vents. No air flow from the vents when the heater or air conditioning is activated is another symptom of a bad blower motor. If the heater blower motor burns out or short circuits, it will not function, and therefore will not be able to produce any airflow for the system. The blower motor will usually have to be replaced in order…

Why is the blower motor not working on my car?

My car has an automatic transmission. Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

What does a heater blower resistor do in a car?

“Blower motor” refers to an electrically operated fan in a vehicle that supplies air to the passenger compartment. The heater blower resistor helps control the rate at which the blower motor supplies this air. Definition

Why does my blower motor only work at slow speed?

Blower motor only working on low speed. Another common symptom of a faulty blower motor resistor is that the blower motor only works at slow-speed. This can be caused because of bad wiring between the blower motor resistor and the blower motor itself.

Where is the relay on my blower fan?

With the key ON, the controls do nothing. I get no clicks from the relay under the glovebox – the only relay that clicks with the blower knob is the one under the fuse panel on the drivers side of the engine bay and I believe thats the AC relay.

Is the blower resistor on my GMC Sierra on fire?

This was preformed on a 2004 GMC Sierra with a blower resistor that had been on fire and melted the wiring. Loading…

Why does my GM blower motor resistor keep failing?

In some cases, the heat is so high that it melts the connector. This is common on late model GM vehicles. If you discover a melted connector, do NOT attempt repair. Purchase an upgraded pigtail and splice it into the harness along with a new blower motor resistor.

With the key ON, the controls do nothing. I get no clicks from the relay under the glovebox – the only relay that clicks with the blower knob is the one under the fuse panel on the drivers side of the engine bay and I believe thats the AC relay.

When did General Motors start using stepper motor?

Sometime in the late 90s General Motors decided that they would control their temperature and mode door operation with an electric stepper motor. These devices receive a signal from the climate control panel and set the door to the desired position. The problem is the early mode door actuators became unreliable.

Why does my Chevy Tahoe blower not work?

unknown at this time. probe the yellow wire going to the blower and to a ground for the power circuit test at any speed for juice if you have power for the most part you likely have a broken motor. if you have no power at all including at the high setting there is still a big fuse in the under hood block and should be rated at 50 amps.

Can a fan switch be replaced on a Tahoe?

I had to replace the fan switch on my old 99 Tahoe. You should be able to run power direct to the motor, Gordy. It will only run in high, but if it doesn’t run with direct power, it’s hooped. OK, I hooked a wire from positive battery post to terminal with the purple wire on the motor. Nothing.

What does the resistor on a heater do?

It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

What should I do if my blower motor stops?

Replace blower motor. If you have a variable speed blower motor, replace the blower motor speed control module. If you have a three or four speed blower motor, remove the blower motor relay. If the motor stops, replace the relay. Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period.

Why does my blower fan only work on one speed?

by Lee Sallings. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time.

What causes a fuse to blow on a blower motor?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

by Lee Sallings. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time.

Replace blower motor. If you have a variable speed blower motor, replace the blower motor speed control module. If you have a three or four speed blower motor, remove the blower motor relay. If the motor stops, replace the relay. Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period.

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.

Where is the blower motor resistor located on a car?

It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

Can a blower resistor be replaced on a Ford Ranger?

Video tutorial on how to replace the blower motor resistor on a Ford Ranger. This is a fairly common issue amongst Rangers, Explorers, and most likely the Mazda B series trucks as well. The main symptom of a failing blower motor resistor is that your fan speed will only work on the high setting.

Why is my Dodge Ram blower resistor bad?

There are various failure modes in the blower motor resistor. Part of the resistor could fail or the entire resistor could completely fail. Also consider that your fan speed control could be faulty. There is also a chance that your blower motor is bad.

What are the symptoms of a faulty blower motor resistor?

Another symptom of a faulty blower motor resistor is that the blower motor is not able to work on some settings. This causes the blower motor to malfunction or not function at all in one or more settings. It is highly probable that the blower motor switch has stopped working.

There are various failure modes in the blower motor resistor. Part of the resistor could fail or the entire resistor could completely fail. Also consider that your fan speed control could be faulty. There is also a chance that your blower motor is bad.

If any of these resistances show an open circuit, then the blower resistor desires to get replaced. Know what fee you should pay to get your automobile constant. The average cost for a blower motor resistor substitute is between $80 and $150. Labour costs are envisioned among $35 and $80 even as elements are priced between $50 and $75.

Is the speed of the blower controlled by the resistor?

The blower speed can be adjusted in almost every modern car. Some cars have blowers that have 4 to 5 fixed speed settings that can be selected, but in this case, the speed of the blower motor is controlled by a blower motor resistor. 1. No air blowing through vehicle’s vents

Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.

What causes blower motor to quit working on Blazer?

On my 97 Blazer, the blower motor will suddenly quit working while the anti-lock brake light will simultaniously light and the cruise will switch off. A half hour later, all three will switch back on.

Why are the windows on my 97 Blazer not working?

I have a 97 S-10 Blazer with 60k that has an intermittent elcectrical issue with the blower motor and windows not working. The ABS and brake light flash on and off across the dash as if it is doing a systems check while driving the vehicle. At the same time the blower motor stops working and the windows wont work. Now, it wont start at all.

What are common reasons my Chevrolet Blazer has heater problems?

What are common reasons my Chevrolet Blazer has heater problems? While there are a variety of reasons your Chevrolet Blazer heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

What kind of motor does a Chevy Blazer have?

I have a 1997 Chevy Blazer 4.3L. I have a new blower motor, interior fan switch, resistor, and AC components. I have 2 issues: 1) The blower motor intermittantly cuts out. 2) The highest speed does not work-it stays the same speed as the 3rd position.

Blower motor only working on low speed. Another common symptom of a faulty blower motor resistor is that the blower motor only works at slow-speed. This can be caused because of bad wiring between the blower motor resistor and the blower motor itself.

Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. The replacement parts come in individual units, sets of two resistors, or as part of a blower motor resistor kit.

When your Dakota or Durango left the factory, it had a Mopar motor and voltage resister that were compatible with each other. After 10-15 years the motor wears out , begins to draws more amps burns up the resister. Most people replace the wiring harness and the resister with. cheap replacement from Autozone / Advanced etc.

What does the blower motor resistor do in a BMW?

What does the blower motor resistor do? The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents.

Can a blower motor go out and smoke a resistor?

A blower motor that is going out can smoke a resistor. I lost #5 (no melting, relay in resistor crapped out) and after replacing the resistor the motor clamped at 23A and some change. I replaced the motor just to be on the safe side and it was right around 22A.

How do you test a blower motor resistor?

When a switch, a resistor, and a load are wired in series, the resistor “drops” some of the voltage passing through it, effectively reducing both current flow and voltage at the motor. A voltmeter connected to both ends of a resistor while current is passing through it to a load will measure the amount of voltage being “dropped” by the resistor.

How does a relay work on a blower motor?

Finally, with the fan switch on the highest speed, the fan motor is receiving system voltage (14.5 with the engine running). Some systems will energize a relay when the switch is set at the highest fan speed. The relay then closes its contacts, feeding full voltage to the fan, because a relay can handle the current better than the fan switch.

What makes a fan blower motor not work?

There was no rust in mine. A lot of dark black brush residue, couple pieces of what appeared to be small leaves, and dirt. The fan motor parts themselves were very clean after I knocked on the concrete floor to knock the debris out. I think the lube and cleaning made the difference.

How can I tell if my blower motor has a problem?

Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times. The system enters the self-diagnostic mode and at the end of it, if there is a problem, the fault code will be displayed on the display.

My car has an automatic transmission. Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

What are the symptoms of a bad blower motor relay?

3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

Why is my Chrysler heater blower resistor bad?

If your heater blower only blows on high speed, most likely the blower resistor is bad. But, to be sure you must test it. Here is how to find it, test it… If your heater blower only blows on high speed, most likely the blower resistor is bad.

Is there a recall on blower motor wiring?

RECALL 17V-676: BLOWER MOTOR WIRING New information provided by this revision is preceded by this symbol . Please perform the procedure outlined in this Service Information on all affected vehicles before customer delivery.

Testing Honda power transistor (blower motor control module). For example, in the 2009 Honda Accord, the service manual describes the procedure as follows: Turn the ignition to ON. Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times.

Why does my blower draw a high current?

The calculated current draw based on speed and discharge pressure is 68 amps but the motors are reported to be drawing 90 Amps. They have already burnt out one motor but this may have been due to a bearing failure. Is there any reason for a motor to pull higher than normal current other than just plain overloaded?

Why does my blower not work at high speeds?

Blower works on slow speeds, but not on high speed. Check for bad fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. Also, check the fuse for the control side of the high speed relay. Make sure the ground side of the high speed relay is working. Blower works on some speeds but not others

Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times. The system enters the self-diagnostic mode and at the end of it, if there is a problem, the fault code will be displayed on the display.

Average rating from 849 customers who received a AC is not working Inspection. The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

What to do if your electric leaf blower is not working?

Electric leaf blowers are a straightforward piece of equipment that many gardeners use. If one is not working properly, the problem will be small and probably not difficult to locate. Here’s a routine to check your leaf blower from plug to mouth.

Is there a problem with my leaf blower?

So, if you have a leaf blower, once in a while, you might find that it is not working properly. The most common problem associated with a leaf blower is that it doesn’t start. So, how to fix a leaf blower that won’t start? You need to make sure that you check out the common problems first.

Why is my HVAC blower running very slowly?

Typically Red=Low, Blu=Med, Blk=High. The black lead is usually the one needed for a/c operation. Sometimes the motors wear out by having the lubricant in the bearings go dry. In this case the blower wheel will not turn effortlessly and smoothly by hand when the unit is off. If the bearings are dry, then you need a new blower motor.

What happens if you lose the blower motor relay?

The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor,…

Can a blower fan only work on high speed?

Blower Motor Fan Only Works On High Speed? Plus – Tips To Prevent Repeat Failures! If playback doesn’t begin shortly, try restarting your device. Diagnostic training videos and content hosted by ASE Master and L1 Certified Technicians.

If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be.

Why is my AC blower running very slow?

If the bearings are dry, then you need a new blower motor. (unusual) Since you have a heat pump, if it is a higher performance model it may have an electronic blower speed control that is supposed to automatically slow the blower when it is very cold outside to ensure an adequate warm air temp inside.

What kind of resistor does a blower fan use?

The newer style of blower resistor uses electronics to send small pulses to the blower motor and based on how frequent the pulses are can speed up and slow down the blower fan. Blower motors can be fairly cheap if they are a manual resistor block style.

One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow.

Where is the blower motor resistor located?

The blower motor resistor is located under the dash on the right hand (passenger) side. It’s near the firewall, just below the windshield.

What is an AC resistor?

Resistor AC Response. For ordinary currents and frequencies the behavior of a resistor is that of a dissipative element which converts electrical energy into heat. It is independent of the direction of current flow and independent of the frequency. So we say that the AC impedance of a resistor is the same as its DC resistance.

What causes an electric fan to slow down and stop?

The run capacitor stores charge and delays the current momentarily, which gives the fan rotor time to turn and orient itself so that the induced magnetic force is effective. When the capacitor burns out, the electric current through the coil is too steady to generate torque, and the fan slows down and stops.

What should voltage be for server fan to slow down?

A motor with 7-13V operation voltage should be able to reach the specified RPM in the specified voltage range. If the voltage goes below 7V, it will not immediately stall but gradually slow down. At 3.5V most 12V fans will still rotate, albeit very slowly, and some may require a push to start.

The run capacitor stores charge and delays the current momentarily, which gives the fan rotor time to turn and orient itself so that the induced magnetic force is effective. When the capacitor burns out, the electric current through the coil is too steady to generate torque, and the fan slows down and stops.

What is the resistance of a fan resistor?

Again, ohms law suggests that at full speed this fan has a resistance of 5.2Ω so adding an 11Ω resistor in series should drop the overall current to 0.74A (8.9W rather than 28W) with 6W through / 8.1V across the resistor and 2.9W through / 3.852V across the fan.

A motor with 7-13V operation voltage should be able to reach the specified RPM in the specified voltage range. If the voltage goes below 7V, it will not immediately stall but gradually slow down. At 3.5V most 12V fans will still rotate, albeit very slowly, and some may require a push to start.

How much does it cost to replace a blower motor?

See: how to check a fuse in a car. If a blower motor is bad, it will need to be replaced. The blower motor replacement costs from $320 to $650, depending on the car. In many cars it’s fairly easy; the blower motor is located behind the glove box and held by 3-4 screws.

Where is the blower motor resistor located on a F-150?

When the blower motor is in the HI (4) position, the blower motor resistor is bypassed. The blower motor resistor is located on the heater core and evaporator core housing behind the glove compartment. Temperature Blend Door Position The temperature blend door actuator moves the temperature blend door on command from the HVAC module.

What do you need to know about the blower control module?

Basics Of Troubleshooting The Blower Control Module. The blower control module is a solid state device unlike the old style blower motor resistors that actually use resistors. It controls blower motor speed by varying the voltage it sends to the blower motor.

Basics Of Troubleshooting The Blower Control Module. The blower control module is a solid state device unlike the old style blower motor resistors that actually use resistors. It controls blower motor speed by varying the voltage it sends to the blower motor.

Where is the resistor on a fan blower?

The symptom sounds like a bad blower resistor. The resistor is the black thing held on with 2 bolts back under the dash behind the right side of the glove box. Just look underneath, you don’t need to remove anything to get to it.

In the 2008-2011 Ford Escape, the resistor is located behind the glove box on top of the HVAC unit air duct. It’s held by two screws and is easy to replace. See the photo. In the 2008-2011 Ford F150 the blower motor resistor is also located behind the glove box, but is installed in the right side of the plastic air duct.

Why does the blower motor resistor keep blowing?

The blower motor is probably worn out and drawing too much current causing the resistors to blow. Check that and the plug up to the blower and resistor for any melted wires.

What is a blower motor resistance?

How to replace fuse on blower motor resistor?

So, this is my spin on it. Use a die grinder or equivalent to remove the original crimps down to where the lead breaks in two and the fuse will fall off. Use the pointy end of the grinder bit to just carefully drill the rest of the material out and take a bit of the galvanized surface down to clean metal.

Why is the resistor on my Ford Escape not working?

For example, as you can see in this photo, the blower motor resistor in this Ford Escape has failed due to corrosion. If the resistor shows no visual damage, the resistance between terminals must be checked and compared to specifications. If the resistance is out of specs, the resistor must be replaced.

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.

How to test the blower motor in a Dodge?

This is the correct and expected test result and let’s you know that the blower motor amperage draw is within specification. The next step is to manually apply power and Ground to the blower motor itself. For this test go to: TEST 2: Applying Power And Ground To The Blower Motor.

How do you find out the amperage draw of a blower motor?

To find out the amperage draw, we’ll test the blower motor’s resistance. Then we’ll divide the resistance value by 12.5 to calculate it’s amperage draw (Ohms Law: Amps = Volts ÷ Ohms). The amperage draw, of your Dakota or Durango’s blower motor should be under 40 amps. Disconnect the blower motor from its electrical connector.

How to check masterpro ignition 4 blower motor resistor?

Read reviews for MasterPro Ignition 4 Terminal Blower Motor Resistor When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures. When autocomplete results are available use up and down arrows to review and enter to select.

How to replace blower motor resistor O’Reilly Auto Parts?

O’Reilly Auto Parts has replacement blower motor resistors to fit most cars, trucks and SUVs. When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures. When autocomplete results are available use up and down arrows to review and enter to select.

Where is the blower motor and resistor located?

The blower motor resistor consists of a molded plastic mounting plate (1) with an integral wire connector receptacle (2). Concealed behind the mounting plate are coiled resistor wires contained within a ceramic heat sink (3). The blower motor resistor is accessed for service by removing the glove box from the instrument panel.

The blower motor resistor consists of a molded plastic mounting plate (1) with an integral wire connector receptacle (2). Concealed behind the mounting plate are coiled resistor wires contained within a ceramic heat sink (3). The blower motor resistor is accessed for service by removing the glove box from the instrument panel.

Do you need a blower motor resistor harness?

Replacement AC Blower Motor Resistor Kit With Harness – Controls the fan speed in your AC and heating system. If you can no longer adjust the air speed with your AC controls or your AC system no longer blows chances are you need a new Blower Motor Resistor. This COMPLETE KIT includes the Blower Motor Resistor and New Wire Harness.

What should the resistance of a blower motor resistor be?

For example, in this photo we measured the resistance of this blower motor resistor. According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself.

What are the symptoms of a worn out blower motor?

One of the symptoms of a worn out blower motor is that it can intermittently produce a loud screeching noise when running. How to test a blower motor? If the blower motor doesn’t work at all, the blower motor itself must be tested first. Typically it’s done by measuring the voltage at the blower motor connector when it’s turned on.

What kind of motor do I need for my blower?

ACDelco Blower Motors are the ideal replacement motor for the original equipment on most GM vehicles. Space- and weight-efficient, ACDelco Blower Motors are built to quietly and efficiently… Magnetic-type motor is designed to handle the demands of continuous operation. Brushless and magnetic-brush styles available.

How is the speed of a blower motor controlled?

This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. Blower resistors are made of several resistors with different resistances.

Where is the resistor on a blower fan?

Some common locations are near the blower fan motor, under or behind the dashboard, around the passenger footwell etc. Once the resistor is located and detached, it is often possible to say whether the resistor has burned out or not judging by the physical appearance only.

This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. Blower resistors are made of several resistors with different resistances.

Some common locations are near the blower fan motor, under or behind the dashboard, around the passenger footwell etc. Once the resistor is located and detached, it is often possible to say whether the resistor has burned out or not judging by the physical appearance only.

Is the 10 Amp Fuse on my heater fan burned out?

The 10 amp fuse was not burned out. The blower motor resistor was a little rusty.I inspected and found no burned or melted wires anywhere , at the inside three way dash switch , at the blower motor and at the resistor.I know the air bag is tied into the same fuse , I must have replaced the fuse 12 times .

Where are the fuses on a blower motor?

The blower motor fuse (and possibly fan switch in the dash) are two things that would be within my capability at least. should be in the same fuse box where the relay is.lid should be marked for fuse positions and relay positions on top of the lid or under it.check the fuses first before replacing anything else!

What to do if your blower switch goes bad?

I went through and replaced all the major culprits.. a new blower motor, new blower resistor & harness, and new blower relay. Wouldn’t you know, still nothing. What possibilities are left? I was wondering if the switch itself (in the dash) can go bad.. I don’t get this. Great timing in the summer heat!

Look for obvious signs of corrosion and burns from overheating. If you see signs of overheated connectors, replace the blower resistor and its connector, but again, you must splice the wires right, or you’ll have problems at the splice later on.

Why is my blower motor not working properly?

If the capacitor is good and there is no mechanical failure with voltage applied to the motor, it’s an electrical failure.” “If there’s power going to it, the capacitor checks out, and the motor still doesn’t run, it’s bad,” Beaulieu added. “Or, it could be that the motor does run but is very noisy and drawing high current.

How does a high speed blower motor work?

In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

What makes a blower motor run in shorted mode?

In the shorted mode power ties to the blower motor and makes it run regardless of the ignition switch position. You can locate the module by following the wires back from the motor. The module will be mounted to the air ducting for cooling. So I’m assuming it will b ok as long as I turn switch off right?

Why does my car blower motor not shut off?

If you have a vehicle with climate control system and a variable speed blower motor and the blower motor won’t shut off and stays on HIGH with the car turned off and the key out, chances are the blower motor motor control processor is toast or the HVAC control module is damaged.

In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

When to run the blower before starting the motor?

The blower is suppose to be turned on for (4) minutes before restarting the motor each time the motor has been shut down. Doesn’t matter if it was shut down 15 minutes ago or yesterday or last week. Run the bllower before starting the motor. Now if you are running the blower while cruising, you are basically doing it for nothing.

What causes a blower motor resistor to burn up?

Blower motors that are starting to go bad are often a cause for resistors burning up. The bad motor will draw too much current and cause the heating that damages everything. An armed society is a polite one. Manners are good when one may have to back up his acts with his life.-Robert Heinlein

The transistor or resistor assembly is often mounted in the HVAC system and is accessible from the outside. If the blower doesn’t work at all, try tapping the outside of it with the palm of your hand. This might cause the motor to start working. If this is the case, you likely have a bad blower motor or a loose connection somewhere.

When do you need to replace a blower motor?

If you don’t feel any airflow coming out of the vents, it may mean that a problem with the blower motor has developed to the point where the component is entirely inoperable. In this case, you’ll have to replace it with a new motor.

Why is my furnace blower not running?

If your furnace is going off on limit you might have an air flow problem like a dirty filter, dirty blower, slow blower motor (might need a new capacitor) stopped up evaporator coil or too much gas pressure. All of these can cause the furnace to over-heat and go off on limit.

Why is my blower motor only working at high speed?

The first thing that needs to be determined is the type of noise that is present and the possible sources. Rattling or knocking noises while… The blower motor only working on high speed is a common symptom of a failing blower motor resistor; but the fact the radio stopped working at the same time is unusual.

Is there a high speed blower motor relay?

Yes there is a high speed relay which sounds like it is out. Here is a guide to help test it and the blower motor wiring diagrams so you can see how the system works with the relay location below as well. Check out the diagrams (Below).

What to do if your blower is not working?

The very first step you need to take is getting a scan run on the computer. Take your car to a technician or a local parts store and have them scan the car. They will give you a list of… Hello there, thank you for asking about your 1998 Oldsmobile LSS.

What causes a blower fan to not work?

When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end.

Is the fan under the dash of my HJ75 working?

The fan (blower under the dash) of my 1988 hj75 does not function. Suddenly stopped. Replaced the fan. Still not working fan (blower under the dash) of my 1988…Replaced..tested ok…

Why is the blower fan on my Holden Rodeo not working?

Blower fan not working in my 1997 holden rodeo . The fan it self works hooked up straight to a battery and the fuse and relays seem fine so why has it stopped working. … read more I have 92 HJ75 4.2 Diesel (1HZ) with after market Turbo (Garret) set at 9psi, over heats, has new radiator,water pump and fan. Had no problems last 5yrs.

What to do if your heater blower is not working?

Was able to pull one of the vents out on the front of the dash & kinda got some access to the blower motor wires, ol test light lit right up when the switch was turned on. There is a rubber vent tube connected to the back end of the motor & after pulling that loose, I could rotate the armature easy so its not locked up in the shaft bearings.

Where is the blower control switch on the dashboard?

The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.

What does it mean when your furnace blower is not working?

A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. Check the furnace flame for a complete blue color.

How do you fix a bad blower motor?

Connect the black lead to a ground and then to the blower motor assembly. Connect the red lead to a power source and then to the leads on the motor side of the disconnected connector. If the motor turns, the connector is bad. Repair the connector. If the motor still does not turn, the motor is bad. Replace the motor.

How can I test if my blower fan is working?

Test the connection to the blower motor. Take two jumper leads, one black and one red. Connect the black lead to a ground and then to the blower motor assembly. Connect the red lead to a power source and then to the leads on the motor side of the disconnected connector.

When does a blower motor start to fail?

In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up.

When did the first Lincoln Navigator come out?

In this article, we consider the first-generation Lincoln Navigator, produced from 1998 to 2002. Here you will find fuse box diagrams of Lincoln Navigator 1998, 1999, 2000, 2001 and 2002, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Where is the power distribution box on a Lincoln Navigator?

The power distribution box is located in the engine compartment (on the driver’s side).

Why does my Ford Expedition not have a front blower?

I bought a used 2017 expy from carmax and had no front blower. They sent it back to the dealer and I wanted to know exactly what was found. I was told the 40 amp fuse had a bad connection and was reset with dielectric grease, that was it, has worked fine since.

Where are the fuses in a Lincoln Navigator?

1998: #10 (I/P Auxiliary Power Socket), #11 (Console Auxiliary Power Socket) in the Instrument panel fuse box, and fuse #3 (Cigar Lighter) in the Engine compartment fuse box. 1999-2002: fuse #3 (Cigar Lighter) in the Instrument panel fuse box, and fuses #1 (Power Point), #4 (Console PowerPoint) in the Engine compartment fuse box.

Where to find blower motor resistor on Ford Explorer?

Look up your part online and then you’ll know what to look for under the hood. Just remember it will be in the immediate vicinity of the blower motor. 3 people found this helpful.

How can I tell if my blower motor resistor is faulty?

Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor.

What does the blower motor resistor do in a car?

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

What should I do if my blower motor is not working?

If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls.

What causes a blower motor to overheat?

Decreased airflow causes the blower motor resistor to overheat and fail. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Blower motor is drawing too much power. Check the cabin air filter for clogging.

When do you Know Your blower motor is going bad?

This is one of the first signs of a bad blower motor that people tend to notice. Your motor will wear out over time—this is just part of the general wear and tear your vehicle experiences.

Why does my HVAC blower need to be replaced?

The blower motor is the part of your HVAC system that uses the most energy, so it may very well be the culprit if you see a significant rise in your utility bills. An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption.

In case of a defective electronic blower controller, the functioning of individual or of all blower levels could be impacted. The fuses should initially be checked. The controller itself is installed in the passenger footwell area and can be easily uninstalled by removing two screws.

Why is my blower not working on my Nissan X Trail?

Interior blower not working Should the interior blower fail partially or completely in above vehicle, a defective electric blower controller might be the cause. In case of a defective electronic blower controller, the functioning of individual or of all blower levels could be impacted. The fuses should initially be checked.

Why is my AC blower not working?

A common problem behind an air conditioner blower not starting includes overheating, which keeps the motor from running. Let your air conditioner rest and cool down for a while before trying to turn it on again; if the motor works at that point, overheating is probably the problem.

Why is my Ford Galaxy heater not working?

PS there is a Haynes book for the Ford Galaxy which includes the PD engine,most things are the same as the Sharan and Alhambra. Only working on four is a classic resister failure but you fitted a new genuine unit. Working on 3 and 4 suggests a switch fault so as the resistor is new, try a new switch.

Why does my AC blower motor work intermittently?

Intermittent electrical problems can make you feel like your a blind man trying to catch a stray dog. You can’t post conmments that contain an email address.

Why does my Ford blower fan not work?

Worked perfect for about 8 months. The third time in the shop, the mechanic wired the blower directly to the battery and it worked fine so he knew it wasn’t the blower motor. He checked electrical continuity through the dash and said it was okay. He thought there could be a loose ground wire along the main branch of wires???

Intermittent electrical problems can make you feel like your a blind man trying to catch a stray dog. You can’t post conmments that contain an email address.

What happens to a resistor on a blower fan?

Resistors have it rough. They always have electricity flowing through them, and the voltage can change sharply as you adjust the strength of the blower fan. If a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor’s temperatures to dangerous levels.

What kind of motor does a variable speed blower use?

Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

Yes there is a high speed relay which sounds like it is out. Here is a guide to help test it and the blower motor wiring diagrams so you can see how the system works with the relay location below as well. Check out the diagrams (Below).

Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

What happens if the blower motor only works on high speed?

In other designs, the failure of 1 resistor means you lose only one speed. However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode.

Where is the resistor for the blower motor located?

Two individual resistors make up the blower motor resistor assembly on your Chevy pickup. As you’re probably already aware, these resistors are located between the A/C-Heater control panel and the blower motor . The purpose of these resistors is to reduce the amount of the blower motor’s current that’s passing through them.

Is there a way to test a blower motor?

Blower Motor Resistor Testing Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. Move the lead from terminal 2 to terminal 3 and check this reading against specifications. Move the lead from terminal 3 to terminal 4 and check this reading against specifications.

What to do if your Ford F-150 blower unit fails?

Ohm meter confirmed a bad blower motor. Put the old resistor back in with the new blower motor problem solved $140 later. For my truck speeds 1, 2 and 3 were dead and 4 would work intermittently and eventually shut off completely. Hope this helps.

Why does my Ford heater have no heat?

The Ford Heater temperature control issue comes down to this: A problem with the variable resistor inside the blend door actuator, in which case you must replace the actuator or, A problem with the blend door actuator motor, in which case you must replace the actuator or, A problem with a binding or stuck blend door. the blend door by hand.

What to do if your air vent is not blowing the correct air?

IMPORTANT: If your vents are not blowing the correct TEMPERATURE air, please call us at 800-547-2049. This is a different yet related issue, and we may still be able to help you.

What to do if your EATC is not blowing the correct air?

If the backlighting on your EATC has begun to fail, we offer an additional service to replace all of the backlighting in the unit. We have two options to choose from: standard bulb replacement or LED upgraded bulbs. IMPORTANT: If your vents are not blowing the correct TEMPERATURE air, please call us at 800-547-2049.

Where is the blower motor resistor located on a 2012 F350?

Related Ford Questions A 2000 f350 super duty truck the ac stops blowing air i have a 2000 f350 super duty truck the ac stops blowing air i have tooken this truck to midas and thy have but new blower in it thy have tested wires and it is all good thy put another relay in it is works …

How can I lower the blower speed of my furnace?

If you want to solve the air noise problem, move the return air filters out of their hallway locations back to the upstream side of the return air duct at the furnace. In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses.

How does running an external blower reduce heat loss?

In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses. These two losses comprise the magnitude of heat losses. Narrowing that hysteresis loop will:

What happens to the heat exchanger when you lower the blower speed?

Yes–the efficiency of the heat exchanger will decrease. The blower energy draw at a lower speed will be offset by the loss in fan wheel inertia. But you will have a tough time measuring either on your basement Trane.

What happens if the blower speed of an AC unit is too high?

If a blower speed is set too high, your AC might not be operating optimally. This is because the evaporator coil will not be able to adequately dehumidify the space in need of cooling. On the other hand, if the blower speed is too low, your evaporator coil is at risk of “freezing.”

Which is Dorman blower motor resistor harness for Ford truck?

This Dorman 973-307 harness is exactly what was needed to get my truck’s hvac fan working again with all 4 speeds functional. Use it with the hvac blower motor resistor 973-011. Both worked perfectly in this application. See photo. Replaced my burned OEM connector perfectly!

How do you plug in a Ford Motorcraft blower motor resistor?

The plug fit perfectly and securely into the new ford motorcraft blower motor resistor. I suggest using a dab of dielectric grease on the each terminal of the connector and the edges of the connector before inserting it into the resistor socket.

If your blower motor has stopped working, check the connector. If it’s in bad shape, or has melted, it may be the cause of the motor’s failure. Get your blower motor working with a connector from O’Reilly Auto Parts. Check out our blower motor resistor connector options for your vehicle.

Why does my blower motor resistor harness melt?

When the resistor and the harness get corroded over time, the resistance builds up in the connector and will melt the connector due to excess heat. This can also be due to the fact that an old blower motor that has corrosion and rust in the motor will pull excess amps as well, resulting in excessive amp draw of the whole circuit.

How does a blower motor work in a car?

Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.

If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls.

Why does my blower fan not start when I spin it?

But yes in general if the motor will run when you give the blower fan a spin then usually the problem is the starting capacitor (if present) OR a bad start relay control switch.

Where does the ground go in a Honda blower motor?

The blower motor control module (Honda calls it Power Transistor) supplies the ground. The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor.

What causes a blower motor resistor to overheat?

Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor. For example, this happens when the fan blade is jammed by a foreign object or when the motor bearings are worn out and it doesn’t spin freely.

The blower speed can be adjusted in almost every modern car. Some cars have blowers that have 4 to 5 fixed speed settings that can be selected, but in this case, the speed of the blower motor is controlled by a blower motor resistor. 1. No air blowing through vehicle’s vents

The added resistance in the circuit slows down or speeds up the blower motor as needed. Locate the fuse for the blower motor in the owners/service manual. Test the fuse, with the ignition key on, using the 12-volt test light.

How do you fix a car heater that has blown?

Disconnect the battery and the wires connected to the motor, making a note of how they fit . Attach one side of the tester to the motor earth wire and probe each of the feed terminals in turn. If the tester lights on all the terminals, the motor is sound. But if the tester fails to light the motor has blown and will need replacing.

How does the blower motor work on a Honda Accord?

Typically it can be activated by pressing and holding different buttons. Testing Honda power transistor (blower motor control module). For example, in the 2009 Honda Accord, the service manual describes the procedure as follows: Turn the ignition to ON.

Why is my car heater not working properly?

The most common cause of any problem is a blown fuse. This is normally in the main fusebox although it may be an in-line fuse wired into the feed of the motor itself. Check in your workshop manual to find the exact position of the fuse.

What to do if your AC or heater is not blowing?

If your Blower Motor for the AC or Heater suddenly stopped blowing, look here first, it might save you several dollars. Situation, we have a friend that owns a 2017 Chevy Trax LT, she is a nurse who works with my wife, single mom and on a single mom budget.

Disconnect the battery and the wires connected to the motor, making a note of how they fit . Attach one side of the tester to the motor earth wire and probe each of the feed terminals in turn. If the tester lights on all the terminals, the motor is sound. But if the tester fails to light the motor has blown and will need replacing.

How does the HVAC control head work on a blower?

In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module.

What are the signs of a bad heater motor?

Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. 1. Blower motor stuck on one speed 2. Blower motor does not work on certain settings 3. No air from the vehicle’s vents Average rating from 130,908 customers who received a Vehicle Engine Cooling Inspection.

Why does my Ford PowerStroke blower quit working?

Well the “NEW” blower motor is as weak, or weaker, than the original 13 year old Ford blower. That isn’t the problem. It’s been on the truck for 1 day and it’s going back to RockAuto. Today in the 90 degree heat, it decided to just quit spitting anything out of the vents altogether.

When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end.

The blower resistor is connected in series to the blower fan motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

Well the “NEW” blower motor is as weak, or weaker, than the original 13 year old Ford blower. That isn’t the problem. It’s been on the truck for 1 day and it’s going back to RockAuto. Today in the 90 degree heat, it decided to just quit spitting anything out of the vents altogether.

What to do if your blower motor only works on high speed?

If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block. It’s usually located in the ductwork (to keep the coils cool) below the glove box.

How to reset the engine control module with no hassle?

Disconnect the battery and Switch the ignition key to the on position for about 15 minutes should reset the ECU Can a ECU be reset? Yes, all ECU (Engine Control units) can be reset and be should reset once per manufacturer’s guideline for a smooth relearn process or upon installing a replacement unit. How do I reset my Ford PCM?

Is it a hassle to reset your ECU?

Resetting your cars ecu, should not be a hassle at all as there are many more ways to reset your ECU and there are many more reasons for doing so.

How does a 3 speed blower motor work?

Older style blower motor resistor with exposed resistor elements. The blower motor resistor is what’s responsible for giving you three blower speeds. The resistor block contains three different high resistance coils. Think of these coils like a filament in a light bulb.

What causes a blower fan to turn faster?

The lower the resistance of the selected resistor in the pack, the higher the current that flows through the blower fan causing the fan to turn faster. The statements expressed above are only for informational purposes and should be independently verified.

So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor.

What’s the problem with my blower motor fan speeds?

Probably a bad blower motor resistor you have there, or possibly a faulty blower motor or switch. The most common thing would be the resistor assembly, as that goes out more often than the other parts. A quick check with a test light can determine failure. No Heat In My 2000 Chevrolet Malibu – Blower Not…

What happens when a blower resistor goes bad?

This is usually the case after a blower resistor failure on one or more speed settings. What is happening to them you ask? Well, the resistor itself has quite an electrical draw to keep that blower motor powered up.

How do you change the blower motor on a car?

Removal of the right side dash trim is usually all it takes to access the heater/blower area of the vehicle. A couple screws later and the resistor is out and unplugged from the blower motor. Installation of the new resistor is just as easy, and has a new harness that plugs into the existing blower motor. Now it gets just a tad more intricate.

Why is my Ford Escape blower not working?

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It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

How is the resistance measured on a heater blower?

If the appearance is normal, it is necessary to a degree the resistance throughout every individual resistor. The resistors are all linked to a single common point. Switch the multimeter to the resistance measuring mode, connect one probe of the multimeter to the commonplace point and use the other probe to degree resistances at other points.

Why does heater blower motor increase in resistance?

As part of our comfort and luxury, the blower speed is one of the most adjusted settings in a car, and so the resistance of the blower motor is constantly being put under stress, which can eventually lead to motor failure; too much humidity in the atmosphere can lead to an increase in resistance.

Why does my AC fan only work on high?

If your speed selector for your AC or Heat only works on high, or low, or if its missing any particular speed, this video will show you how to fix it once and for all. This is a fix for 2nd generation Dodge Rams (1994-2001-2002 2500/3500) Loading…

How to fix a Chevy Express heat fan blower?

– Resistor Replacement, Wire Harness Repair – YouTube Chevy Express Van- Ac/Heat Fan Blower issue Fixed! – Resistor Replacement, Wire Harness Repair If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations.

For example, as you can see in this photo, the blower motor resistor in this Ford Escape has failed due to corrosion. If the resistor shows no visual damage, the resistance between terminals must be checked and compared to specifications. If the resistance is out of specs, the resistor must be replaced.

If your speed selector for your AC or Heat only works on high, or low, or if its missing any particular speed, this video will show you how to fix it once and for all. This is a fix for 2nd generation Dodge Rams (1994-2001-2002 2500/3500) Loading…

Where is the blower resistor on a 2017 Chevy?

Hit the A/C button, compressor is coming on, so not a low Freon issue. On the 2017, I located the blower resistor plugged into the duct on the passenger side, upper left area of the foot area, was surprised to find out that it could be accessed without even removing the cover for the blower area.

Hit the A/C button, compressor is coming on, so not a low Freon issue. On the 2017, I located the blower resistor plugged into the duct on the passenger side, upper left area of the foot area, was surprised to find out that it could be accessed without even removing the cover for the blower area.

What to do if your heater motor resistor is failing?

If your vehicle is displaying any of the symptoms above, or you suspect that your blower motor resistor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced.

What to do if your AC blower motor stops working?

Had the same problem, You Need a volt meter and need to “Know How to Use It” to fine this one. Take readings at the motor connector when it is working right and write them down on paper, when it stops working again, take the readings again.

Why is the blower motor not working on my GMC Yukon?

All appear fine. I then pulled the blower motor out of dash and determined there was power to the plug at the motor. I bench tested the blower and it worked fine. I have power from the switch to the blower resistor and from the resistor to the motor. Plugging the resistor back in, plugging the motor into the resistor but the motor fails to work.

Where is the AC blower motor resistor harness located?

If you can no longer adjust the air speed with your AC controls or your AC system no longer blows chances are you need a new Blower Motor Resistor. This COMPLETE KIT includes the Blower Motor Resistor and New Wire Harness. The AC Blower Motor Resistor is located on lower passenger side dash and is easily accessible by removing a few screws.

Why is my front blower motor not working?

My son, which drives the vehicle, stated that the blower motor just stopped working while going down the road. I began checking it out by checking all fuses and relays. All appear fine.

When to replace your AC blower motor resistor?

Replaces Part# – 89019088, 973-405, 15-81086, 22807123 on various vehicles from model years including 2003, 2004, 2005, 2006 and 03, 04, 05, 06 with manual AC controls and without rear A/C vents in the center console OEM Fit, Quality, Finish – A direct replacement for your your factory HVAC Fan Blower Motor Resistor.

Why is the blower on my GMC not working?

A few brief tests revealed the Blower Control Module had failed and was not providing power to the blower motor. Gm vehicles with digital climate control use a Blower Control Module instead of a Blower Resistor to control power to the blower motor. Failure of this module and it’s manual HVAC counterpart the Blower resistor is common.

Why does my Ricks free auto blower motor not work?

A clogged cabin air filter reduces airflow through the ducts, increases current draw on the blower motor and can cause blower motor resistor overheating and premature failure. If you replace the resistor and it burns out again, check the current draw on the blower motor.

In other designs, the failure of 1 resistor means you lose only one speed. However, most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode.

A clogged cabin air filter reduces airflow through the ducts, increases current draw on the blower motor and can cause blower motor resistor overheating and premature failure. If you replace the resistor and it burns out again, check the current draw on the blower motor.

What are the symptoms of a failed blower motor resistor?