Question about GMC Sierra 1500

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The internal cooling fan in my truck came on by it self today and stayed on for about 45 min. there was no key in the ignition. there was nothing i could do to shut the fan off. when i drove home to check this out the fan shut off as i was looking at the fuse panel to see if i could get it to shut off with removing the fuse. didn't get time to do this. problem is if it comes on by itself say at night and dosen't shut off the battery will of course discharge. what can i look for. your answer can be as detail as you want without using very sufficticated vehicle test eq. which i don't have.

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What year is your truck?
was it parked in a hot area?
some cars and trucks have thermostats that turn on the fan when the engine is off this may be normal for your truck
check the owners manual

Posted on Sep 15, 2008

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