Question about 2006 GMC Sierra
I have a 2005 gmc sierra. the blower does not blow on any setting. when it went out it just didnt work once and then worked fine the next day and then didnt work at all the day after that. i can diagnose the problem i just don't know where to start.
First check that the blower has power to it and when turned on a varying ground signal when the speed switch is moved between the speeds. You will need a DVOM to test this.
Posted on Mar 19, 2014
GMC has had some problems with the wiring connecting to the blower melting. It also could be the relay. Call a GMC dealer to have the problem fixed if it is from overheated wires and it should be covered under a not so well known recall. My 2006 was covered and I did not know it until I went to pick it up and they said "no charge". In this case I was glad I went to a dealer. Good luck, Richard
Posted on Mar 20, 2014
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Posted on Jan 02, 2017
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.
Posted on Jan 07, 2010
Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."
check the coolant level in radiator. if its low it will only circulate while driving, and not while idling. May also be a bad water pump. See a professional for that.
Posted on Nov 08, 2010
Tips for a great answer:
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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