1997 GMC Jimmy 1997 Jimmy Fan Blower starts by itself when

1997 GMC JIMMY
200,000 MILES • 6 CYL • 4WD • AUTOMATIC
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FIVE25TWO
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We have heard the blower running in our carport many times. I had always thought it was somehow tied into some type of humidity sensor, to clear the windshield, but it runs so long, it has from time to time drained the battery. I have spoken to the dealer, he said it may be a short (i dont think so) and no help there, I have resorted to pulling the fuse for the heater blower at night, and this prevents it from happening.
Incidently, when I start driving, and the vehicles gets to temperature, I hear a metalic "pop" under the dash, and I recognise this noise as a bi metalic thermostat used in other applications.
Not sure where to start searching. because this happens about an hour after parking, and for a short time, it is hard to diagnose. Suggestions?
Apr 21, 2008 at 11:22 PM
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STRAILER
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Hi, it sounds like you have a short because that circuit goes dead when the key is removed. But if you have "automatic" climate controlled, replace the fan speed controller. please let me know
Apr 22, 2008 at 1:36 PM