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.

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.

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 is the speed of the blower motor controlled?

On climate control systems without automatic temperature controls, the blower motor speeds are controlled by a switch wired to a stepped resistor that usually includes a thermal fuse.

What are the symptoms of a bad blower motor resistor?

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.

When do you need a new blower motor?

If you are getting 120 volts to the motor and it is not starting then you have a blower motor problem and either need another new blower motor or a new blower motor run capacitor. If you are not getting voltage to the blower motor out of the control board then you probably need a new control board again.

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.

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.

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.

What should I do if my blower fan is not turning?

Repair the connector. If the motor still does not turn, the motor is bad. Replace the motor. Test the switch. Plug the connector back in to the blower motor, and then trace the wire harness back to the connector closest to the blower motor switch, usually located under the dash. Disconnect the connector and set the multimeter to ohms.

What to do if your car AC is not blowing?

Depending on what kind of car you have, it should be a pretty simple fix. The problem sounds like it is with your blower motor, not your AC system. Hopefully, the blower motor simply blew a fuse. Find your fuse panel and check the fuse for the “blower motor” or “vent fan” or something like that.

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 my furnace blower not working?

One of the most common problems with furnace fans is a bad blower relay . The first thing to do is check the relay or voltage from the board. If no voltage is recorded, you will have to replace the board or the relay. If there is a battery, check if it is working properly. This is another common reason behind faulty blower fans.

What would cause the furnace blower not to turn on?

1 – Low airflow Dirty Air Filters. If you don’t change your air filters often enough, the filters will become dirty and clogged, which means the heat exchanger retains heat and eventually causes it Dirty Blower Wheel. If your furnace goes on and off too quickly, it could be a dirty blower wheel. Closed or Blocked Air Supply Vents.

What causes the AC blower not to come on?

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.

How is a blower fan connected to a battery?

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.

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.

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 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 common reasons my GMC Safari has heater problems?

What are common reasons my GMC Safari has heater problems? While there are a variety of reasons your GMC Safari 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. See what others are asking about their GMC Safari.

Why is my blower not working on my expedition?

Blower runs fine when hooked up to 12 volt power. No power on any wires that go into the fan speed controllers on both. Temp & position controls seem to work, I can hear stuff moving in back when I turn them. Is/are there relays somewhere that could be bad… really stumped on this one. Check the aux a/c relay.

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.

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.

Can a blower fan work only when the thermostat is set to fan on?

Fan will work only when thermostat set to fan on. Thank you for the question, Anon, as it’s a common A/C, or heating fan operating problem that needs to be understood: I put it as “The blower fan runs only in the MAN-ON switch but won’t run on AUTO”.

Why is my AC blower not working?

What are the symptoms of blower motor failure?

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

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.

What to do when air blows out of defroster vents?

Assuming that your actuator has failed in the most common position, blowing out of the defroster vents only, you should not have to do anything other than installing the actuator motor. No indexing of the door shafts to the cam/cog or recalibration of the actuator motors.

What are the fuses on a GMC Safari?

License Plate Lamp, Taillamps, Parking Lamps, Ashtray Lamp, Panel Lights, Trailer Taillamps, Front and Rear Sidemarker Lamps, Door Switch Illumination, Headlamp Switch Illumination, Rear Seat Audio Illumination, TBC Module L, M1, M2 Blower Motor, Rear A/C Relay Coil, Front Cont. Temp. Door Motor, HI Blower Relay, Defogger Timer Coil

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.

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. The coil resistance causes them to heat up, thereby reducing the amount of voltage that can flow to the blower motor.

Why does my front blower not work in my Dodge Grand Caravan?

I have been dealing with this issue for over a year. 2008 Dodge Grand Caravan. Front blowers don’t work when back ones do. AC is still cooling. Turn van off, restart and everything works again. Maybe for minutes, maybe for days or weeks. Four different mechanics and dealers have looked at the problem.

What was the problem with my Sebring LXI?

I had a 2001 Sebring sedan which developed this exact problem. Turns out that the fan switch resistors had burned out. The dealer fixed it for me for $60. I found out later that the parts only cost about $12, and, I easily could have fixed it myself. Boy am I glad I found this site! I am having the exact same problems with my 2002 Sebring LXI.

Why is the Check Engine light on on my Sebring Conv?

All was fine one minute, but then suddenly the check engine light came on and the heater began blowing cool air. The light stayed on through several engine startings, but, last time I looked it was off. But the heater is still not heating. This is a 2001 Sebring Conv Limited (2.7 L) with 56K miles…

Where is the resistor on my Sebring convt?

Blower Motor Resistor Switch Mopar part number 1-04885844AA cost $19.31, installed it myself in 45 minutes. The fan blower on my ’99 Sebring convt.has just now started to work only on HI speed. Would someone please explain to me where the resistor is located and how to get to it (if it is hidden behind panels, etc.).

I had a 2001 Sebring sedan which developed this exact problem. Turns out that the fan switch resistors had burned out. The dealer fixed it for me for $60. I found out later that the parts only cost about $12, and, I easily could have fixed it myself. Boy am I glad I found this site! I am having the exact same problems with my 2002 Sebring LXI.

All was fine one minute, but then suddenly the check engine light came on and the heater began blowing cool air. The light stayed on through several engine startings, but, last time I looked it was off. But the heater is still not heating. This is a 2001 Sebring Conv Limited (2.7 L) with 56K miles…

Blower Motor Resistor Switch Mopar part number 1-04885844AA cost $19.31, installed it myself in 45 minutes. The fan blower on my ’99 Sebring convt.has just now started to work only on HI speed. Would someone please explain to me where the resistor is located and how to get to it (if it is hidden behind panels, etc.).

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.

Where does the power from the blower motor come from?

Power for your blower motor comes from the fuse panel under the hood and through the ignition switch. You should have 12 volts on the green wire at the blower motor any time the ignition key is on. The resistor and switch are on the ground side of the circuit.

Where does the power come from on a Dodge Ram blower?

Experience: 2005 Dodge ASE master technician of the year Verified Power for your blower motor comes from the fuse panel under the hood and through the ignition switch. You should have 12 volts on the green wire at the blower motor any time the ignition key is on. The resistor and switch are on the ground side of the circuit.

Can a Dodge Ram blower motor work on the AC?

Dodge Ram blower motor won’t work on the heater and AC. There is no power going to the blower motor, fire reducer or to switch. Fuses are good, relays are good but it will not heat or cool the truck. How to fix this? Show More

Where is the green wire on a Dodge Ram blower?

You should have 12 volts on the green wire at the blower motor any time the ignition key is on. The resistor and switch are on the ground side of the circuit. The switch takes various legs of the resistor to ground to control current through (and thereby the speed) of the blower motor.

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.

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.

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.

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.

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.

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 causes a bad or failing blower motor relay?

Blown fuses. 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. Any sort of electrical spikes or excessive current…

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

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

The blower motor is crucial to the proper functioning of your HVAC system. This video will show you how to properly diagnose your blower by using the multimeter to perform an AMP draw as well as replacing the blower motor relay. Loading…

What to do if your AC blower is not working?

Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

Blown fuses. 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. Any sort of electrical spikes or excessive current…

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.

Why is my blower fan not working on my Ford F 150?

Blower fan not working – 2004-2014 Ford F-150 and other models. Blower Motor Resistor Replacement If playback doesn’t begin shortly, try restarting your device.

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 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.

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.

What causes a leaf blower to not start?

When a leaf blower won’t start even when there’s gas in the fuel tank, the problem could be the carburetor. The step-by-step repair guide explains how to rebuild a leaf blower carburetor. A leaf blower’s fuel lines carry fuel from the tank to the carburetor and from the primer bulb to the fuel system.

What causes a blower motor to stop running?

Most blower motors ground through the case of the motor when it is screwed into place or by a small ground strap from the case to the body of the car. Over time, the ground connection can become corroded or loose, causing the motor to function intermittently. Lee Sallings is a freelance writer from Fort Worth, Texas.

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.

Why is my front AC blower not working?

I’ve seen many posts from people whose front AC blower would stop occasionally. My wife would kick the wires under the glove compartment and it would start again. It finally failed altogether. Following the advice from other owners, I replaced the blower motor resistor. That didn’t help.

What to do if your leaf blower wont pull?

Tie a knot at the end of the rope after putting it through the hole to stop it from slipping out, making sure that there is a little rope left after the knot as possible. You can cut off the excess rope after the knot to prevent the extra rope from getting stuck.

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.

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.

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.

What happens when no crank / no start / no blower?

When it no crank/no starts there is no sound except relays in the under the hood fuse box. Nothing at all from the starter. Battery putting out 12.5V and tests good.

Why is my Radio not working on my car?

Everything works properly when the key is turned all the way back. The radio, wipers, etc. It sounds to me that the person who worked on the problem didn’t do something correctly when putting things back together. It may be kind of hard to prove that though. The switch worked correctly before the service work was done but not after the work.

What should I do if my Silverado Sierra has no blower?

Nothing at all from the starter. Battery putting out 12.5V and tests good. Alt putting out 14ish v when it’s running. • B+ (Pin B) on ignition switch harness and body ground. • Pin A and Pin B (on either side of B+) on ignition switch and body ground. Dash, radio, all things can except blower work in this state.

Why does my Ford F-150 make a high pitched noise?

If any of the before mentioned did happen then it may have caused a programming glitch in the BCM, unfortunately the only place that can properly diagnosis a BCM problem right now is a Ford dealer. 14 people found this helpful. See if you can find what is making the high pitched noise.

How to test the blower motor switch in Ford 4.0L?

CASE 2: All circuits tested had continuity where indicated in the test steps. This is good and is the correct and expected test result that tells you that the blower fan switch (in the A/C-Heater control panel) is NOT defective. Your next step is to bypass the blower resistor using a simple jumper wire.

Where does the battery go on a Ford blower motor?

The end result is that your Ford’s blower motor now runs in M1 speed. Battery power is available on terminal 2 of the blower switch connector (YEL/RED wire). This battery power is now diverted to terminal 4 of the blower switch harness connector.

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.

What happens to the blower motor in a Ford?

In tech speak: circuit 2 and 3 is now considered ‘open’. The end result is that your Ford’s blower motor now runs in M2 speed. This interruption and diverting of battery power goes on for all of the other blower fan speeds.

How to test the blower motor resistor Ford 4.6L?

How To Test The Blower Motor Resistor (Ford 4.6L, 5.4L). How To Test The Blower Motor (Ford 4.6L, 5.4L). The blower motor switch works by rerouting the current that passes through it from one internal contact to another. To be more specific, as you turn the blower speed knob… the blower switch ‘opens’ and ’closes’ two contacts.

What should I do if my blower won’t shut off?

Refer to either the Blower Motor Control Processor Replacement or Blower Motor Processor Replacement-Auxiliary procedures in SI. After replacement of the blower motor control module, the customer may notice a slightly higher than expected blower motor speed at any of the blower speed settings.

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,…

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.

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 can I tell if my blower speed switch is faulty?

Test for power at all the blower speeds by moving the blower speed switch through all positions. A faulty resistor loses power at different positions on the switch. High blower speed has direct power to the motor from the switch. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse.

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.

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.

Test for power at all the blower speeds by moving the blower speed switch through all positions. A faulty resistor loses power at different positions on the switch. High blower speed has direct power to the motor from the switch. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse.

What do you need to know about a Ford Escort?

Brakelamp, electronic automatic transaxle module powertrain control module, high-mount brakelamp, horn, shift interlock system, speed control Powertrain control module (1.8l engine), ecterior lamps, interior illumination, parking lamp relay, warning chime module

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.

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.

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.

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.

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.

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.

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.

What causes a Ford F-150 engine to turn off?

5.4 Triton Engine Failure of the Fuel Pump Driver Module This problem is typical for the Ford F-150 with a 5.4 Triton engine. Failure of the fuel pump driver module usually cuts off the petrol feed to the engine which, of course, causes the engine to turn off, thus cutting power to all essential systems.

Why does my furnace blower make so much noise?

The blower is made up of a blower motor and a blower fan, and issues with one or both of these components could be making your furnace much noisier than it has to be. If that’s the case, use these tricks on how to quiet a noisy furnace blower so you can be warm in peace:

How to replace heater blower motor with fan cage?

Buy Now!New Heater Blower Motor with Fan Cage from 1AAuto.com http://1aau.to/ia/1AHCX000651A Auto Shows you how to repair, replace, fix, change or install a AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features

Why does my furnace blower not turn on?

Is your furnace blower motor not working and there is no air coming out of your vents? Perhaps your blower motor has burnt out and you need a new one. Or maybe it is just simply not getting any power therefore not turning on. In this video I show you how you can check if your HVAC blower motor is bad or if it is the control board that is defective.

What to do if your Mercedes heater blower is not working?

My blower motor was fixed in with 3 posidrive screws. Had to use a stubby screwdriver on one of them too due to a serious lack of room. Check first before just pulling it out Rooty.

Why is the blower motor not working on my car?