What are the symptoms of a bad blower motor relay?

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.

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.

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.

Why does my Chevy Impala make a clicking noise?

Loud clicking/tapping/clacking noise coming from behind the dash related to the HVAC operation. The problem is one of the two blend door actuator in the dash behind the glovebox is failing. To fix you’ll need: open the glovebox and extend it down by popping the stops at the back of the glovebox under the lip on the dash panel.

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.

How to fix the HVAC on a Chevy Impala?

open the glovebox and extend it down by popping the stops at the back of the glovebox under the lip on the dash panel. remove the screws holding the glovebox to the glovebox door and to the latch mechanism.

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 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

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 to do when front blower doesn’t work?

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.

Why is the blower motor on my Dodge Ram not working?

Discussion in ‘ Tech Info ‘ started by HeavyD, Dec 10, 2016 . Ok was driving & doing errands today, blower motor working good – no problems. Then after dropping stuff at home, got back in the truck & blower motor does not do anything. Checked the #4 fuse, even swapped it with another & still nothing.

Is the heater motor on my Dodge Ram working?

The switch was about what prices are on the net, but the heater motor was way more. New ignition switch in & with old fan it works. Will be putting fan in yet today. All back together, the ignition switch is tight but works good. Did the exact thing last month.

What kind of wire does a blower fan use?

I ghetto jumpered a 16 gauge wire from the back of the metal clip on the ground wire to the dashboard impact bar/brace and the fan turns at variable speeds with the knob! All positions of “on” work – low, medium, high, and full blast.

Why is there no ground on my blower motor?

It seems, too, that the black ground wire on the blower motor (accessible from just below the dash) has NO ground potential. I ghetto jumpered a 16 gauge wire from the back of the metal clip on the ground wire to the dashboard impact bar/brace and the fan turns at variable speeds with the knob!

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 an AC compressor clutch receive power?

AC compressor clutches receive power in a number of ways. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches. Or, the relay can be operated by the PCM which has interpreted the condition of the low and high pressure sensors.

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 is the speed of the blower motor controlled?

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.

Which is the AC clutch on a Dodge?

Dodge is showing part 5003 681AA as the AC clutch. It is a whole lot cheaper to change out just the clutch as you could probably do it with the compressor still hooked up and full of freon so you would not have to get a new drier and refill the system. Not sure.

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.

Where is the a / C clutch on a Cummins diesel?

The A/C clutch field coil to the front of the compressor using a snap ring (5). pressed onto the front of the compressor. engine accessory drive belt.

What is a blower control switch?

The blower motor switch is the physical control switch for the AC blower settings, and is therefore critical to the overall functionality of the AC system.

What is a blower motor control?

The blower motor is the electrical switch on the interior of a vehicle that allows the driver to control the vehicle’s heating and air conditioning system. It is usually built into the the same control panel that houses all of the AC system controls, and is labeled with numbers and symbols to indicate blower fan speed.

What is a blower motor relay?

The blower motor relay is what cuts on the blower to release the cold air into the cabin of the car. When you turn on the switch in your car to activate the air conditioner, the blower relay will turn on and release the power needed to turn on the blower fan. This part of your car is only used when the air conditioner is turned on.

What can cause an electric motor to fail?

Improper lubrication will not only damage bearings, but can also throw grease into the windings. Moisture in the form of condensation can cause rust within a totally enclosed motor. Vibration, belt tension and misalignment are among the major causes of motor failures that started as bearing failures.

How can you tell if your air conditioner blower motor is overheating?

If your blower motor is overheating, you’ll see some very clear signs. One of the common signs of overheating is a burning smell coming from the vents. This is usually accompanied by a complete system shutdown. An air-conditioner with an overheating blower motor may shut itself off to prevent damage and electrical hazards.

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.

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.

Why does my furnace blower make a noise?

The most common cause of the noise is from one of the blower motors. Specifically it can be from a faulty or bad start capacitor for the larger blower motor. That problem would result in a noise only at startup. Our noise was constant the entire time the furnace blower was spinning.

Why does my blower motor make a squeaking noise?

This may be a sign of a faulty blower motor. As you might know, these have electric motors in them that wear out over time and will begin to make squeaking or grinding noises as the bearings begin to wear out. The electrical contacts may also wear out causing the motor to fail.

Why does my AC Heat fan make a clicking noise?

If your interior AC/ Heat fan (blower motor) is making noise like a card in a bicycle spoke, then you probably just need to clean out the blower motor which is easy and free. Leaves and debris gets in the blower motor and make a clicking noise when the fan hits the leaves.

Why does my furnace make a rattling noise when I Turn on the heat?

Your blower motor waits a few minutes for your heat exchanger to fully heat up before it starts blowing air (otherwise, it’d just be blowing cool air). So if you only hear a rattling noise several minutes after the thermostat clicks to turn the heat on, you probably have one of the 3 issues listed above.

Why does my car heater make a loud noise?

Loud noises you hear when your car’s heater or air conditioner are on typically indicate a blower motor issue. The good news is that a blower motor problem like this can be the result of something as simple to fix as debris or trash that got caught in it.

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.

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.

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.

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 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 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.

What happens when your Ford Taurus heater stops working?

At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Taurus, this process has failed in one way or another.

How can I tell if my blower motor is bad?

The motor should spin at its highest setting. If it does then you have a problem with the connection at the plug. If not, you have a bad motor. The blower gets it’s power from a relay. In the case of my 1996 Ranger the relay is behind the passenger side headlight. If there is no voltage and the fuses are good, check the relay.

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…

Where is the AC blower relay located?

The blower motor relay is located in a wire harness connector that is secured to the Heater-A/C housing behind the glove box on the passenger side of the vehicle, next to the Heater-A/C wire harness connector in the passenger compartment.

Where is the fuse for the blower motor?

The blower motor fuse should be a 30 amp located in the passenger compartment just to the left of where the driver sits, underneath the dash above the left kick panel. It should be marked blower.

Where is the blower motor on a Mercedes Benz?

The motor can be seen hanging down close to the passenger kick panel. Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen. This is the blower motor resister, which controls the fan speeds. Disconnect the multi-wire connector from the blower motor resister next to the blower motor.

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 was the wire that melted on my blower?

One of the center wires is burned and melted about 1/4 inch outsode the plug. By wiggling that wore I can get speeds one through four to work again, but the wore and plug get really hot. I bought the connector and resistor at Auto Zone last time, the one that’s in there now.

What causes a blower motor resistor to melt?

Arching is what’s melting the connector. when you put the connectors together it may be a good idea to take a scratch awl or pick and squeeze the spade connectors in the plug tighter. You must log in or register to reply here.

When to replace a heater blower motor switch or relay?

When the motor gets old and tired it will draw more current through the wires than a new motor. It may still draw enough current to blow the fuse after it runs for a while. In that case, a motor replacement is in order. Step 1: Disconnect the battery. Put on your safety glasses and disconnect the battery at the negative cable.

What to do if your heater fan relay is not working?

Put everything back together the way it came and re-program the code into the radio if needed. If you’ve checked the fuse panel, and the fan motor doesn’t run at all, or if it runs only on the lower speeds, the blower motor relay may be at fault. Relays are used to carry electrical loads that are too large for conventional switches.

What happens when you change the fuse on a heater blower?

If the fuse is blown, replace it and then try the blower. If the fuse blows right away, your car may have a bad blower motor or some other problem in the system. If the blower works when you change the fuse, you may not be out of the woods yet. When the motor gets old and tired it will draw more current through the wires than a new motor.

What is the blower motor on a Ford Explorer?

By the way, the original blower motor on your 4.0L Ford Explorer (Aerostar, Ranger, B4000, Mountaineer) may not look exactly like the one in the image viewer. Don’t worry, since the only difference will be that one has the plug (where the harness connector connects to) right on the body of the motor and the other has the plug on two extended wires.

Why does my Ford 4.0L have no blower?

There’s a good chance that what’s causing the ‘no blower’ problem on your Ford is a bad blower resistor or a bad blower switch. Altho’ it’s beyond the scope of this tutorial to diagnose these components… you have at least eliminated the blower motor as bad.

What does it mean when your blower motor does not work?

CASE 2: The blower motor DID NOT run when you applied battery power and Ground with the jumper wires. This test result tells you that the blower motor is bad and needs to be replaced. The next subheading will show you where you can buy the blower motor and save a few bucks. You can find the blower motor in any auto parts store.

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

What happens when the alarm goes off on a challenger?

I have a 2014 Challenger, alarm went off, passenger window went down. I turn off alarm with fob. Now the gauges turn off and on, is says damaged keys. Window wont come up, says pass door is open. Headlights flicker, turn signals dont work, inside lights come on and off, and now push start wont work.

What are the symptoms of a bad blower motor relay?