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.

How to test the blower motor resistor ( GMC )?

Thankfully, testing the blower motor resistor is not that hard and in this tutorial I’ll show you 4 different tests that will help you troubleshoot it and find out if it’s bad (or not). This tutorial applies to several Chevrolet, GMC and Oldsmobile pickups and SUVs.

Why does the blower speed Hi stop working?

‘HI’ is the only blower speed that doesn’t depend on the blower resistor to function. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. To explain this a bit further, this is due to the nature of how a resistor reduces the voltage that passes thru’ it by converting some of it into heat.

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.

Why does my GM blower make a squealing sound?

Squealing and screeching sounds coming from beneath the passenger-side dash when the A/C, heat / blower motor is on. The sounds happen in cold or humid weather, and especially when hitting bumps in the road or slamming on the brakes.

What to do if your GM blower motor is screeching?

First try spraying WD-40 in through the bottom hole of the motor mount. You can see the end of the motor shaft just inside the raised ‘nipple’ on the motor housing. Inside that nipple is a bearing that the shaft is spinning inside of and those are the two parts that seized up from drying out.

What does WD40 do to a GM blower motor?

Inside that nipple is a bearing that the shaft is spinning inside of and those are the two parts that seized up from drying out. By spraying WD-40 in there you may be able to free them up without having to remove the blower motor. And Here is a closer view: 3.

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 can I get a blower motor resistor upgrade kit?

For Blower Motor Resistor Speed Control Module Upgrade Kit 19329838 19260762 (Fits: More than one vehicle) Hassle Free Returns. Free Fast Shipping. 5.0 out of 5 stars. 4.0 out of 5 stars. 3.0 out of 5 stars. Hassle Free Returns. Free Fast Shipping. 3.5 out of 5 stars.

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.

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.

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 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.

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 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.

When do you Know Your HVAC blower motor needs to be replaced?

For example, squealing or screeching noises may mean that the blower motor has a damaged belt or bearing problems, which can be fixed by replacing the belt or lubricating the bearings respectively. If the motor is making rattling, clanking, or banging sounds, it may be because of a loose or broken part.

How can I diagnose a blower motor problem?

If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. Even better an automotive meter to verify good power and grounds at the blower motor. I often find DIY car mechanics will skip checking the ground and move right onto parts replacement mode if they find voltage to the fan motors.

How does a resister block work on a blower motor?

The resister block used on many models is coupled with a control module. It’s used to control the output speed of the blower motor. A resister block will adjust its total resistance as selected by the driver from the switch. As more resistance is applied to the circuit the slower the interior fan motor will spin.

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.

What does it mean when a blower motor resistor fails?

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. This means after replacing the blower motor resistor, check if the blower motor runs freely and doesn’t make any noise.

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

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.

What happens when you replace a blower motor resistor?

In this case, the heater and air conditioning system may still function normally pushing the cold or hot air out of the vent beside the speed. The resistor needs to be replaced with a new one in order to restore its function. Another common symptom of a faulty blower motor resistor is that the blower motor only works at slow-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.

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 is the problem with my 97 Passport?

My ’97 Passport appears to have some weird electrical problem. At random times, the battery indicator will start to move in sync with the turn signal or show a drop with any other pull on the battery (lights, radio, etc.).

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.

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.

When to replace the blower motor power transistor?

If the resistance IS NOT within specification, we can conclude your Honda Civic’s blower motor power transistor is bad and needs to replaced. Now, if the resistance is within specification, then we need to continue on to the next test (which is testing the power transistor diode).

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.

How to test a blower resistor with a multimeter?

Probe terminals A and C with your multimeter test leads (see image 2 of 4 in the image viewer). Your multimeter should register continuity of about 0.8 to 2.2 Ohms. Your multimeter should NOT register OL ( open loop ).

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.

Where exactly is the blower motor resistor?

Usually it’s located in the dashboard on the opposite side of the steering wheel. You can’t see it because it’s inside the vehicle, but that’s where it is located. The blower motor resistor is the part of the blower motor that controls the speed.

Could You Tell Me the location of the blower motor resistor?

Find the blower resistor and detach it from the rest of the circuit. For the precise location, consult the repair manual for your car’s make and model. Some common locations are near the blower fan motor, under or behind the dashboard, around the passenger footwell etc.

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.

Can you change the resistor on a Hyundai blower?

If that is good try the blue wire next which should run the blower on medium then the white wire which should run the blower at low speed. If it runs properly on all three speeds it confirms that the resistor is good. Merely changing a resistor is no guarantee that the replaced resistor is good.

Why is my Hyundai blower motor not working?

The resistor going bad is a fairly common problem which is easily fixed though it is an issue which is often missed. If this does not resolve the problem then check if there is a problem with the outside ambient air temperature sensor. If this shorts it breaks the circuit and the AC will not work.

Where is the speed control on a Hyundai blower?

There appears to be a problem with the blower speed control which is located next to the blower motor below the blower case. Check the circuit with a test light or voltmeter, especially the wiring from the motor to the speed control. If there’s no problem so far, check the blower motor itself which might have failed.

Check the fuse in the fuse box rated at 30 amps which is for the Blower. Also check the fuse on location 5 of the interior fuse box rated at 10 amps. If both fuses are good then check the blower motor relay which might need to be replaced. If the motor still does not work then in its high position check for power and ground.

When does a blower motor need to be replaced?

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.

How do you fix a blower motor on a car?

Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal.

What should I do if my blower fan wont come on?

You will need to test with a voltmeter and see if your fan motor is getting the required 110 to 125 volts AC out of your control board to start the motor. I would suggest setting your thermostat to the “Fan ON” position. You should be getting 120 volts out of the control board.

Why is my climate control blower motor not working?

The general reason for this is a faulty Climate Control Blower Motor Resistor. Watch Doug, our Land Rover Master Technician, show you how to access and replace the Climate Control Blower Motor Resistor # JGN100010G. Questions about this video? Call our knowledgeable sale staff at 1-800-533-2210 or contact us via live chat.

When does a blower motor resistor need to be replaced?

If the resistance is out of specs, the resistor must be replaced. 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.

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.

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.

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.

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 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.

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.

How do you know if your blower resistor is bad?

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 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.

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.

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.

What happens when you replace the blower motor?

Ya had a motor go at around 72k never replaced a blower motor otherwise in a million miles just German engineering I guess. Update: Since replacing the blower motor, the fan controls seems to have taken on a mind of their own. The fan speed will increase or decrease +2/-2 levels randomly.

What can I do about intermittent blower motor?

Try cleaning it by cycling the control from minimum to maximum rapidly a dozen times or so with the truck off. If that does not work you could take the HVAC controller out and try to get some spray electrical contact cleaner inside the rheostat and again swiping it a number of times.

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 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.

Is there a problem with my blower motor?

When the Blower Motor does work, it works great. Can’t seem to put a finger on this problem. Hopefully someone has the answer! Patiently sweating it out while waiting..

What kind of resistor does a heater blower use?

Types just controlling the fan speed generally just comprise of a few wirewound power resistors (or one resistor with a 3 or 4 windings), which have the effect of regulating the motor speed by reducing the voltage available to the fan. These types always include a thermal trip, which will permanently blow if the rated temperature is exceeded.

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 much does a blower motor regulator cost?

The cost is $640 (R4800) from MB dealer. From a second hand dealer it is $120 for just the regulator that fits the newer blower. I decided that it was too risky, firstly to spend so much on a regulator and blower to which has already failed three times in the past 8 years.

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.

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.

Why do I need a variable speed blower motor?

A variable-speed motor, on the other hand, can operate at lower or higher speeds, which results in a more even temperature throughout your home and better energy efficiency. Similar to other components in an HVAC system, the blower motor will become more vulnerable to mechanical failures as it experiences more wear and tear over time.

What causes a heater to blow cold air?

The following are some issues that may be causing the heater to blow cold air: Low coolant levels. A plugged/clogged heater core. A faulty thermostat (thermostat that is stuck) Broken blower and/or blower motor. Heater core bypass hoses that have leaks.

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.

Is there an intermittent blower motor in a Ford F150?

This vehicle the blower motor would turn on and off intermittently in various conditions, but if the wire harness for the blower controller was wiggled it would come back to life. Wire Harness: https://www.amazon.com/gp/product/B00… Wire Strippers/Crimpers: https://www.amazon.com/Power-Strippin… Loading…

What happens if you lose the blower motor relay?

Where is the blower motor on a Dodge van?

Will either replace it or, in the interim, will have to grease the shaft of the motor. The blower motor on a 1999 Dodge Ram VAN 1500 is located (when facing the front of the vehicle) below the AC/Heater Core box on the left side) along with the Blower Motor Resistor mounted into the side of that box.

Why does my fan blower not come on?

If it does not come on then you might have a control board fan relay that is not sending 120 volts to the blower motor or a bad blower motor winding. You might try to change wires (speeds) on the blower motor to see if that fixes the problem.

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.

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…

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.

Is it bad if the fan motor is not running?

Keep in mind that just because the fan motor isn’t running, doesn’t mean it’s bad. If the power supply is fine and the windings are in good shape, check the capacitor next. The capacitor helps the fan motor run.

Why does my furnace blower not come on?

I have an older Maytag furnace that will fire up but the blower motor doesn’t come on, after a minute the the limit switches will turn of the furnace because it will get to hot. I already replaced the motor, the limit switches, and the motor board but I still have the same problem.

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.

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…

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

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.

How does a motor resistor affect the blower motor?

In those applications, the motor resistor reduces power for the slower speeds and the blower motor has a permanent ground connection to complete the circuit. See the wiring diagram for that setup below.

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 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.

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.

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 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.

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

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 relay for the blower motor?

The blower motor relay could be possibly bad. Relay is located at the fuse block on driver-side, remove plastic door on top of hood release latch. Switch relay with another relay and see if it works. Since my car manual did not show a way to test the resistor, I decided to replace the resistor and that fixed the problem.

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.

Why is my car AC not blowing or car fan not working?

It sounds like your blower motor or fan is damaged. The noise you heard was probably the fan blades hitting the side of your ventilation ducts and it suddenly stopped when either the motor failed or the fan finally got stuck. Replacing the blower motor and possibly fan should get you back to having AC!

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.

Why is my furnace or AC blower not working?

Furnace or AC Blower Motor Not Starting or Working! Top 10 Reasons Why! – YouTube If playback doesn’t begin shortly, try restarting your device.

Where is the blower motor resister 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.

Where is heater blower motor rsistor located?

The heater blower motor resistor is located underneath the dashboard in the heater/AC compartment. The resistor enables the heater blower motor to change the speed of the fan.

Where is the blower motor resister?

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.

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 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.

Is there a blower motor that does not work?

Blower motor does not work on 1 or 2 speeds. I have yet to attempt repair. I replaced the blower motor resistor but selection 4 (high) don’t work. Motor makes a squealing noise for a few minutes but stops on (3). But still blows. Blower only works on high.

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.

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.

What to do if your fan blower is not working?

Took it in the garage, removed the fan, removed the screw holding the plastic housing on and then tried to pry the housing off the motor. It cracked the housing slightly, so I went to plan B: put the fan nut back on the shaft, sat on the floor and held the shaft nut with a pair of vise grips and used my feet to push the plastic housing off.

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.

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.

Why does a Nissan Versa blower motor speed up?

Depending on how the air entry is there and if the outside fresh air was open then car suddenly changing direction can cut off the air for a second due to turbulence, then the fan speeds up because there is less density to bite at. Take any blower with output or input you can block by hand and do it and see what the fan motor does, it speeds up.

What to do if your blower motor relay is bad?

Use Code DIYDISCOUNT. If the problem still exists when you replaced the resistor. The blower motor relay could be possibly bad. Relay is located at the fuse block on driver-side, remove plastic door on top of hood release latch. Switch relay with another relay and see if it works.

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’s the second speed on a dasshboard blower?

This will usually go before the switch which is much more difficult to access inside the dasshboard. Lost 2nd speed. Live with it. 1,3, and 4 speed are sufficient. Blower motor does not work on 1 or 2 speeds. I have yet to attempt repair. I replaced the blower motor resistor but selection 4 (high) don’t work.

What to do if your Chevy S-10 blower does not run?

The other 2 does fine. 1993 chevy s-10 2wd truck, no heat nor a/c, compressor does not run regardless of switch position. This has happened to me as well. The fix is a simple $18-$25 part, the Resistor Block, which is located inside the back Firewall adjacent to the Blower Motor Housing. Two (2) screws and it pops right out.

How does resistance affect the speed of a blower fan?

The lower the resistance of the selected resistor in a pack, the higher the current that flows through the blower fan, and the faster the fan will turn.

What is the name of the Denso fan blower motor resistor?

The label on the outside of the part reads, “Denso 077800-0111, 12V”. One fact that may help someone diagnose the problem is the fact that when the part is unplugged you get Lo and Hi speeds. The good news is that the part only takes about 15 mins to remove and install.

Why is my blower motor not working properly?

This is a classic blower motor resistor problem which is common on older cars and trucks that use manual fan speed switch controls. This problem will also occur on climate control systems when the speed controller has burned out omitting full power to the blower motor. This can also occur with the ignition key off.

Where is the blower resistor on a Subaru?

On most American and import cars and light trucks, the blower resistor is located near or on the blower motor. Nissan and Subaru as well as Chevy and Ford are examples.

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.

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 does the blower work on a Ford F150?

In this video, we look at intermittent blower motor function on a Ford Expedition but will be the same for similar F150’s. This vehicle the blower motor would turn on and off intermittently in various conditions, but if the wire harness for the blower controller was wiggled it would come back to life.

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.

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.

How does a blower motor resistor work in a car?

This is done, so the resistor or a control module is cooled down by passing air. In some older cars, a blower motor resistor was installed on the firewall with the access from under the hood. Problems with a blower motor resistor are common in many cars.

What are the symptoms of a broken AC evaporator?

A broken air conditioner may be a result of a faulty AC evaporator. Symptoms include weak air, strange odors, and fluctuating temperatures. What is the AC Evaporator?

What makes up the core of an AC evaporator?

As warm air passes along the evaporator coils, it collects the heat from the air and makes it cool. The cold air is then circulated through time cabin. Two specific components that make up the evaporator: the core and the coils. When issues occur, in most cases it’s due to leaks created in between these two parts.

Where is the blower motor on a Toyota Corolla?

Find the blower motor easily in a Toyota Corolla. If the air doesn’t increase and decrease with the fan controls, than there is a problem with the blower. Unscrew and remove the glove box assembly. The blower motor is directly behind the glove box. Unplug the electrical connection, unscrew it and remove it.

Why is my blower not working in Hi ( 5 )?

The usual failure of the resistor pack is if it works in HI (5) but not in any other mode or just a few modes. When you switch to high,the blower motor relay coil circuit is grounded and voltage is now applied directly through the relay to the blower motor; bypassing the resistors. So, I would look to see if the relay is ok.

What are the symptoms of a bad ECM power relay?

A bad relay may cause the vehicle to crank, but not start, or sometimes not even crank at all. 3. Battery drain or dead battery. A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off.

How do you test a car relay with no power?

If there is no power, the electrical system must be tested starting with the fuse then the relay. If power is present use the test light connected to battery power to check the ground circuit. if these tests check out, the accessory is bad and needs to be replaced.

Where is the heater fan blower motor relay located?

Automotive Mechanic 25 years of experience Hello – the blower fan relay is located behind the glove box – small black plastic square. Make sure both fuses for the HVAC/heater are good, and have power to them (one is 10 amp, one is 30 amp).

Can a delay on make be used on a blower motor?

A normally open delay-on-make timer can be used to operate a blower motor which is to be delayed for a specified amount of time after an electric, gas, or oil heater has been started. This avoids movement of cold air into a room that is occupied by people. Find your new HVAC system parts at Amperite.

https://www.youtube.com/watch?v=k1aVA9gt-dE

Can a blower motor be removed on your back?

Yes, you will be on your back to remove the blower motor assembly. The blower motor is bolted to the cover. So it comes down with the cover. The you unbolt the motor from the cover and replace it. The resistor is on the other side of the cover, between the motor and cover. Ask Your Own Volvo Question Customerreply replied 7 years ago

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.

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