Climate Control
Blower Motor Resistor
A blower motor resistor controls fan speed by changing how much current reaches the blower motor. Our catalogue lists 145 blower motor resistors from $7 to $311 for 1979-2019 vehicles. Chevrolet and Ford lead, with many options for the F250 Super Duty, Tahoe, Malibu, Corvette, F150 and Mustang.
Shop blower motor resistor by vehicle
Standard Motor Products Blower Motor Resistor RU-440 for Ford F150
Fits 2005–2008 models
Dorman Front HVAC Blower Motor Resistor Kit 973-405 for Chevrolet Silverado 1500
Fits 2003–2006 models
Dorman Front HVAC Blower Motor Resistor Kit 973-405 for Chevrolet Tahoe
Fits 2003–2005 models
Standard Motor Products Front Blower Motor Resistor RU-631 for Chevrolet Silverado 1500
Fits 2007 models
Standard Motor Products Front Blower Motor Resistor RU-631 for Chevrolet Tahoe
Fits 2003–2006 models
Dorman Front HVAC Blower Motor Resistor Kit 973-409 for Chevrolet Silverado 1500
Fits 2006 models
Dorman Front Blower Motor Resistor 973-009 for Chevrolet Silverado 1500
Fits 2003–2006 models
Dorman Front Blower Motor Resistor 973-009 for Chevrolet Tahoe
Fits 2003–2006 models
How it fails
On manual systems, the resistor has several coils that drop voltage for each low speed. On automatic systems, it is often an electronic module that varies speed smoothly.
The classic sign is a fan that works only on high, or that skips one or more speeds. A fan that will not shut off can also point to a failed electronic module. Resistors usually sit in the airflow near the blower motor to stay cool, and a seized or worn blower motor drawing extra current is a common reason they burn out.
Front, rear and harness
Vehicles with rear climate control often have a separate rear resistor. Our listings name front and rear positions.
The connector often melts when the resistor fails. Some listings include a wiring harness or pigtail, along with mounting brackets or a gasket, which lets you replace the damaged plug at the same time. Compare the terminal count and mounting holes with your old part. Brands include Dorman, Standard Motor Products, Motorcraft, AC Delco, API and Forecast.
Fitment and install
Read the fitment table for manual or automatic climate control, since they use different resistors. Match the part number on your old unit when you can.
Disconnect the battery first. Remove the screws, pull the resistor out of the duct, and unplug it. Check the connector for melted plastic or brown pins. If the blower motor is noisy or slow, consider replacing it too, or the new resistor may fail early.
Blower Motor Resistor questions
Why does my blower motor resistor keep failing?
A worn blower motor that draws too much current is the usual cause. A corroded or melted connector can also overheat the new part.
Where is the blower motor resistor located?
Most sit in the HVAC duct near the blower motor, often behind the glove box or under the passenger side dash.
Can I drive with a bad blower motor resistor?
Yes, the vehicle will drive normally, but you may have limited fan speeds. That can make defrosting the windshield harder in cold or wet weather.