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StandardBrand com IntermotorImport com JUST THE FACTS Blower Motor Resistors Preventing Water Intrusion on GM 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 Standard 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 Larger output power device mounted directly to heat sink improves heat dissipation Included wire harness undergoes voltage drop testing to ensure performance Improved umbrella cover design prevents condensation from entering module RTV sealant around heat sink and cover perimeter prevents water intrusion Manufactured in the USA Upgraded 2 oz copper board increases conductivity and power dissipation to prevent overheating RU631 GM Two inches of water will flood module Tech Tip For repairs use an inductive amp clamp to check that the blower motor current draw is less than 80 of the fuse rating on high If the current is too high replace the blower motor Otherwise the new resistor will fail too You should also inspect the mating connector for signs of damage caused by excess heat ST10235BMR
