Question about 2002 Chevrolet TrailBlazer

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I changed the serpentine belt and now there is a humming noise

I have a 2004 chevy traiblazer and the seroentine belt was changed and now the car is humming near one of the wheels that hold the belt

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  • sxygina Mar 08, 2009

    the noise was noticeable with old belt, but it was not as loud

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  • Chevrolet Master
  • 6,674 Answers

If you've double checked to make sure belt on properly, you'll have to identify which wheel (pulley) is making noise and check it for any debris that may have built up on it, or possibility of bearing failure in that part. Was it not noticeable with old belt, or was old belt pretty noisy, and that's why it was changed?

Posted on Mar 07, 2009

  • Mike Butler
    Mike Butler Mar 08, 2009

    Sometimes when the belt is off, a simple spin of the pulleys will tell you which one is the culprit, and other times you feel for roughness, or play in any while you turn them by hand. Try to feel for play in pulley by trying to move it side to side, up & down as well.

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