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Thread: Squeel in a/c

  1. #1

    Default Squeel in a/c

    I have 2003 Tahoe LT with 5.3L engine, I have a bad squeal when the A/C is turned on. Last year I replaced the fan belt about six months ago. Would replacing the tenser fix the squeal. Any help would be appreciated. Thanks Guys and girls, Eric

  2. #2
    Sr. Apprentice
    Join Date
    Jun 2013
    1391 N Jefferson St., Anaheim CA 92807


    Belts under the hood are exposed to high temperature, dirt, water, oil, and high tension. As they age, they get brittle, they crack, they develop a glaze, and they slip. If they start to squeal, you can either tighten them or replace them. Replacing them is the better option, because once they start squealing, they don't have much life left. You can only tighten them so much before they are too tight. If they are too tight they may snap, and they can damage the compressor bearings.

  3. #3


    I was told that you should replace the tensioner as well, the belt is not even 6 months old. What do you think Mark

  4. #4
    Sr. Engineer Dana W's Avatar
    Join Date
    Dec 2011
    Chuluota, Florida


    You sure it's under the hood. Mine started sqealing. Turned out to be a failing bearing in my blower motor. Then again, it's pretty obviouswhen the screaming is coming out of the vents.

  5. #5


    The only time when the squealing happens is when I turn on the air. Eric

  6. #6


    Could very well be the tensioner. Have you Turned on the engine and A/C and left it in park and gotten out and tried to pinpoint the sound in the engine bay or have you only heard it in the cab while driving?
    Clint (TX) 2001 Silverado LS 4.8L auto 2wd ECSB [GARAGE]
    Gasoline or gunpowder: If you ain't burning one, you ain't having fun!
    NRA Endowment Member 5 24 48 88 - Hendrick Motorsports FTW!

  7. #7


    sounds like a blower motor to me...?
    2004 gmc sierra ext z71 5.3
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  8. #8

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    I have to assume the Tahoe/Suburban is set up the same way on a 5.3 as the Silverado, but there is a secondary belt for the AC, it is not a true one belt system. The AC compressor sat at the bottom of the motor on my 99 5.3 and was run off of a thin little belt, which surprised me being my 99 Suburban (although a 350 and old body style) was a one belt system.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  9. #9


    In the spring I replaced that second belt and it was about six weeks later that the squealing started, I will order the parts next month with my 5 year old being sick I have to but just a few parts per month. Thanks Boys

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