Mechanics

INTERMITTENT HEATER SOUND

2002 GMC C2500

Heater problem
2002 GMC C2500 V8 Four Wheel Drive Automatic 33000 miles

I have a 2002 GMC Sierra / 2500. When I use the heater in defrost mode I get an intermittent sound that sounds like an electrical short and a deep sounding grown.
My thought is that the air conditioner compressor is some how trying to start when it should not be? Both air and heater seem to work ok. I have taken it to the dealer and they have not been able to reproduce the problem?
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5times_more
February 7, 2008.




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