Blower Motor Resistors

The Blower Motor Resistor controls the electrical current flowing from the fan switch to the blower fan. It allows motorists to set the fan at different speeds. High-temperature currents can melt the original connectors.

Standard® offers full-line coverage for domestic and import applications, with more than 770 blower motor resistors.

To help you restore proper HVAC functions, we manufacture high-quality replacements in our IATF 1649-certified North American facility. They match the fit, form and function of the original. On top of that, we test them to ensure performance and reliability.

Product Spotlight: Blower Motor Resistor (RU631)

On most full-size GM trucks and SUVs from 2001–2007, the Blower Motor Resistor has two common failure modes: water damage and excess heat.

The GM vehicles are unable to manage condensation. If the duct is clogged, condensation will collect, creating a pool of water that can seep into and flood the Blower Motor Resistor module. Worn OE blower motors can create a demand for current that also damages the module. The excess current melts the wiring and plastic shroud, damaging the interface pins on the controller’s circuit board.

Our RU631 Blower Motor Resistor features several improvements over the OE, including an umbrella cover design that prevents water intrusion and a larger-output power device and upgraded two-ounce copper board that protects against overheating.

Download Product Information

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    Larger output power device mounted directly to heat sink improves heat dissipation

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    Improved umbrella cover design prevents condensation from entering module

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    RTV sealant around heat sink and cover perimeter prevents water intrusion

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    Manufactured in the USA

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    Upgraded 2 oz. copper board increases conductivity and power dissipation to prevent overheating

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    Included wire harness undergoes voltage drop testing to ensure performance

How to Replace a Blower Motor Resistor

In this "Installation Spotlight" video, our ASE-certified Master Technician is working on a 1993 Jeep Cherokee with a blower motor that only works on the high position. Here's how to replace it.