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Blower Motor Resistors

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.

NAPA® Echlin’s 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.

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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.