Question about 2005 GMC Sierra
Check the fuse first thing. If the fuse it good then either the blower motor speed control switch, blower motor resistor pack, or the blower motor itself is bad. Normally the speed control switch rarely goes bad. If some of the speeds did not work prior to total failure then the resistor pack is bad. If that is not the case then apply 12 volts directly to the blower motor to see if it is good. If it runs suspect the resistor pack as the culprit.
Posted on Jul 15, 2010
Everything was just fine then, then I had to get two new batteries,I also had to jump start it a few times, got two new batteries and now the blower is only working on the defrost vents not the vents on the dash. I'm thinking something needs to be reset all the fuese are fine.
Posted on Apr 23, 2012
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Posted on Jan 02, 2017
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The connector that plugs into the blower motor under the glove box became too hot and melted the plastic resulting in the a/c and heat not to work (this includes the windshield defroster). I've been looking up problems and solutions and found that this is a recurring problem with GMC and chevy trucks yet there has not been any recall, in fact the dealerships have an extremely overpriced kit to fix their faulty wiring. About 66,000 mi.
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