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The Heater, defroster blower keeps runing even with the ignition off? The only way to stop it is by unpluging the blower connector.
Sounds like your fan switch has failed and its probably a dealer only item
ITS NOT THE FAN SWITCH. THERE IS A SENSOR WHERE THE BLOWER PLUGS IN AND THIS NEED REPLACING. ABOUT 150 BUCKS FRO DEALER
Q&A > GMC > 1999 GMC Savana 2500
Q&A > GMC > 2005 GMC Savana 2500