The motor the runs the fan in the heating and air conditioning device in a vehicle is called a blower motor. It"s located inside the dash, regularly 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 component that controls the rate of the blower motor.

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exactly how the rate of the blower motor is controlled. See also: photo of a Mazda blower engine resistor Honda blower motor control module.
What is the difference? A blower motor resistor is a straightforward electric resistor. It"s used in cars whereby the blower motor has actually only 4 or 5 addressed speeds, as on the left next in this diagram. See the photograph of the Ford blower engine resistor. Cars with an automatically climate regulate system and also vehicles where the blower speed can be changed gradually space equipped with an digital blower motor control module, view the photo. In most modern-day cars, the blower engine resistor or the regulate module are mounted inside one of the ducts in the HVAC system, close come the blower motor. This is done, for this reason the resistor or a regulate module is cooled under by passing air. In part older cars, a blower engine resistor was mounted on the firewall with accessibility from under the hood.

Blower motor resistor / control module problems

difficulties with a blower engine resistor are typical in many cars. The most usual symptom of a failure blower engine resistor is as soon as the heater fan just runs in ~ the greatest speed setting (4 or 5) and doesn"t job-related at short speeds. In part cars, a failed blower engine resistor can reason a heater pan to prevent working completely. In many cases, a blower engine resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance come the motor rotation causes an too much electric present that can overheat and also prematurely damages the blower motor resistor. For example, this happens as soon as the pan blade is jammed by a foreign object or as soon as the motor bearings are worn out and also it doesn"t spin freely. troubles with a blower motor control module are less frequent, yet it stops working for the very same reason: due to corrosion or overheating when the motor is jammed or shorted. In most instances when a blower manage module fails, the blower engine doesn"t job-related at all. In some cars (e.g., larger GM trucks), a failure blower manage module or processor can cause the blower engine to continue running even with the ignition OFF.

How is the blower motor resistor diagnosed?

This Ford blower motor resistor has actually failed due to corrosion
Diagnostic actions vary. Often a visual inspection the the resistor expose the problem. For example, as you deserve to see in this photo, the blower motor resistor in this Ford Escape has actually failed due to corrosion. If the resistor mirrors no visual damage, the resistance in between terminals have to be checked and also compared to specifications. If the resistance is out of specs, the resistor need to be replaced. because that example, in this photo we measure up the resistance of this blower motor resistor. According to the service manual, it should be about 4-5 ohms.
failed resistor tested with an ohm-meter
In our instance the ohmmeter shows open circuit, which way the resistor has failed. Sometimes, a blower engine resistor could fail early to problems with the blower motor itself. This method after replacing the blower engine resistor, inspect if the blower motor operation freely and also doesn"t make any type of noise. We have seen instances whereby a worn-out blower motor causes a newly replaced resistor come fail again. For example, this issue was common in larger Chrysler and also Dodge minivans. In this case, the blower motor must additionally be replaced. Among the symptoms of a worn out blower motor is that it can intermittently develop a according to screeching noise as soon as running.

How to test the blower motor?

If the blower engine doesn"t work-related at all, the blower motor itself should be tested first. Typically it"s done by measuring the voltage at the blower motor connector when it"s rotate on. If there is a voltage at the motor (at least 4-6 Volt at low speed and also 12 Volt at high speed), yet the motor doesn"t run, the motor is poor or jammed.
testing the voltage at the blower motor. If over there is a voltage at the engine (at the very least 4-6 Volt at low speed and 12 Volt in ~ high speed), however the motor doesn"t run, the motor is bad.
Things choose leaves, twigs, nuts, pieces of a ripped cabin filter deserve to jam the blade of the blower motor. This happens frequently in numerous cars. If there is no voltage in ~ the motor, the entire blower motor circuit must be tested, beginning from a fuse. See: how to examine a fuse in a car. If a blower engine is bad, that will have to be replaced. The blower motor replacement prices from $320 to $650, depending on the car. In plenty of cars it"s fairly easy; the blower engine is situated behind the glove box and also held by 3-4 screws. In rather it could be situated inside the dash (e.g. Mazda 5) which makes replacement difficult. If you need a suitable diagnostic procedure, we have actually posted several web links where you can access a organization manual for your automobile for a subscription fee. Inspect this post, scroll under the page.

How is the blower motor control module tested?

Mechanics at a dealership deserve to diagnose the HVAC device with a scan tool. If the scan device is no available, in numerous cars through an automatically climate control system over there is a self-testing or diagnostic mode.
generally it deserve to be set off by pressing and also holding different buttons. Because that example, in the 2009 Honda Accord, the service manual defines the procedure together follows: revolve the ignition come ON. Press and hold the off button and within 10 seconds press and release the home window Defogger button five times. The system enters the self-diagnostic mode and also at the finish of it, if there is a problem, the fault code will be presented on the display. The organization manual explains the testing procedure because that each code. See, for example, these YouTube videos; include make and model of her vehicle. Another means is to check the voltage at the blower motor, the blower motor regulate module and other parts of the circuit follow to the service manual. For example, in the mentioned 2009 Honda Accord, the + 12V strength is supplied directly to the blower motor through the fuse and also then with the relay.
experimentation Honda strength transistor (blower motor control module).
The blower motor control module (Honda phone call it strength Transistor) supplies the ground. The power transistor has 4 wires: 2 come indigenous the climate manage system control unit, one is the ground, one goes come the an adverse terminal that the blower motor. The business manual advises measure up the voltage at the blower motor, then if not OK, at the power transistor and so on. A failed strength transistor to be a fairly common reason for not working blower engine in part Honda and also Acura vehicles. For example, the Honda bulletin 03-048 defined a difficulty where the blower motor because that the behind HVAC system in the 2003 Pilot would not occupational at all speeds.
Honda blower motor manage module (power transistor)

Repair options

Your neighborhood mechanic or any small repair shop should have the ability to diagnose the problem. The course, the quickest method is to do an appointment v your dealer. Countless dealers have actually the component in stock. The blower engine resistor or manage module replacement is not really expensive. because that example, among our colleagues had actually a difficulty with his 2011 Ford Escape: the fan only worked at the speed 4. He payment $50 come diagnose and also $112 to change the resistor at a neighborhood Ford dealership. As soon as the same problem occurred two years later, that ordered the part online because that $25 and also replaced it himself.
In the 2008-2011 Ford escape / Mazda Tribute, the blower motor resistor is located on top of the HVAC unit, behind the glove box.
In the 2008-2011 Ford Escape, the resistor is located behind the gloves box on top of the HVAC unit waiting duct. It"s held by two screws and also is basic to replace. Check out the photo. In the 2008-2011 Ford F150, the blower engine resistor is likewise located behind the gloves box, however is installed on the best side the the plastic waiting duct. This thread at mirrors where the resistor is located. The author of this blog mutual his endure of instead of the blower engine resistor in Jeep Liberty. In part older cars and trucks, the blower motor resistor is set up on the firewall, with access from under the hood.

How the blower engine resistor works

common blower resistor diagram

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This diagram shows exactly how the blower motor resistor is linked in a common car. In this car, in the highest possible "4" fan rate setting, the resistor is bypassed and the blower motor is powered directly by the fan switch. That"s why in some cars, the blower motor may still occupational in the "High" speed setup if the resistor is bad. In this diagram, the pan switch is set to the rate "1", so the blower motor present is reduced by 3 resistors (R2 + R3 + R4) connected in series. The current flow is presented in blue and red. In the setting "2", there are two resistors associated in series, and also in "3", there is only one resistor. Adding resistance to the electrical circuit to reduce the present in the circuit. When several resistors are associated in series, the complete resistance increases and is equal to the amount of individual resistances.