Question about 2002 Chevrolet TrailBlazer

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I HAVE 02 TRAILBLAZER LTZ, AND IT JUST STARTED MAKING A KNOCKING SOUND THAT SEEMS TO COME FROM ENGINE. THERS IS NO CHECK ENGINE LITE, IT IS NOT LOW ON OIL. YOU CAN HERE KNOCKING SOUND AT IDEL SPEED AND KNOCKING NOISE GET'S FASTER WHEN YOU ACCELERATE BUT NOT LOUDER.

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  • mike loshbough
    mike loshbough May 11, 2010

    check for a loose water pump

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Hello, I see you have a trailblaber with a knocking noise. It sounds like you have an electric fan clutch issue. Believe it or not your vehicle has an electric fan clutch. It looks just like the older non-electric but if you look on the driver side of the fan shroud that is the wire connector you see. It is an exspensive part just for the clutch but thats exactly what you are describing. It doesn't get louder just fast with rpms. Please rate my answer, Thank you

Posted on Mar 06, 2009

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Posted on Jan 02, 2017

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