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2004 GMC Yukon Denali - Squealing within the interior

Our 2004 GMC Yukon has (I think) a fan issue, but from where?
With the cab Fan off or on, with the AC off or on, mainly when driving, not sitting in traffic, high pitch squeal that SEEMS to come from Interior Fan.... off coarse, when you go to the Doctor, or in this case the Dealer, it does not squeal, so the Dealer states no idea what the issue is or how to fix.
Any Idea's on this?? It started this Spring, we are in Idaho, not Iowa, we are near Oregon and Washington. Note: it does not Seem to be the belt engine fan but????

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High pitch squeel usually comes from the cambelt

Posted on Jul 24, 2008

  • Ginko
    Ginko Jul 24, 2008

    high pitch squeel usually comes from the alternator belt (not cam mistype), not the fan, just check your motor, the fan is in front of radiator, and usually does not sqeal, sometmes make a rather scratching noise.
    The AC belt instead typically makes a rather squealing high pitched noise, sometimes all the time, or when you accelerate. It is easy to fix, by replacing it or putting it back in tension.

  • Ginko
    Ginko Jul 24, 2008

    To fix it you put in tension the alternator (serpentine|) belt by moving the gear than sustains the belt.
    Here is a link on how to fix serpentine belt.
    If the noise happens when you turn the steering
    wheel then look also to the power-steering belt.



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Hello woadie4_00 and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 2002 Yukon, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 2002 GMC Yukon Denali
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Get more great (money saving) tips and tricks about your vehicle from:

Thanks for the vote, and good luck!

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