Question about 2005 GMC Envoy

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Heater core or blower motor?

A few weeks ago the fan would not come on for the heat. Then just as suddenly it started working again. Now this week a smell when heat is turned on. No water on floor, no fogging of the windows and not real sure if the smell is antifreeze or like a burnt motor electrical smell.
Any ideas? I am thinking of running AC to see if I can still get odor. But will this eliminate the heater core as possible issue.
Only reason I am thinking motor and not heater core is the fact about it not working and then working again.
Any idea what kind of job blower motor or heater core are on these cars? (whole dash out?)
Vehicle has 39,000 miles V6 ext.

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  • sully8 Dec 24, 2008

    OK fixed it. It was a burnt ground pin on the connector to the resistor of the blower motor. Burnt pin made was causing odor.

    While at the dealer looking up another part in attempt to fix. Parts guy noticed a TSB (Technical Service Bulletin) note on one of the parts. The TSB said change the connector and resistor which worked great.

    This is not a recall yet but should be in my opinion. Dealer price for one 7 wire connector $100.00 resistor $67.00. Connector price is outragous. If you can wait (I could not) order online for half the cost.



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  • 111 Answers

Sounds like your blower motor , you heater core is a non mechanical part and if it were the issue you are correct in thinking you would see fluid on the floor or mist on the windshield.

Posted on Dec 17, 2008


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