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 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. 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.

Next Step

Schedule Vehicle Engine Cooling Inspection

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Repairing a bad heater blower motor resistor

The heater blower motor resistor in your car leads a hard life. It must handle not only the power demands of the fan when you are driving, but it also has to absorb and dissipate tremendous amounts of heat as a byproduct of its normal operation. Over time, the heater blower motor resistor can wear out from a variety of causes. These include overheating, corrosion, vibration, excessive electrical current flow from a bad fan, and exposure to water.

Your mechanic will thoroughly inspect the electrical components and connections that support your fan’s operation. Because the heater blower motor resistor does eventually need replacement in many vehicles, it is usually placed where it is easily accessible to your mechanic. A replacement part should restore the system’s functionality. If your car’s fan speed control resides within a climate control computer unit, the repair will be more complex – and expensive.

It is important that a thorough troubleshooting process be performed to be certain that the heater blower motor resistor is the cause of the problem. Doing this will enable your mechanic to repair or replace only what is actually defective, while not missing anything else that needs attention. In instances where the fan is totally non-functional, for example, the problem could actually be a blown fuse or a bad fan – or both!

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In the 2008-2011 Ford Escape / Mazda Tribute, the blower motor resistor is located on top of the HVAC unit, behind the glove box.threadblog


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