Question about 2003 Chevrolet TrailBlazer

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Loud thumping noise in rear air

My 03 Trailblazer EXT is making a loud thumping noise in the rear air compartment, but when I remove the fuse for heat/air B it stops. What is making this noise and will it be expensive to reapair?

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  • kirker09 Dec 08, 2008

    I have a thumping noise that sounds like an air actuated or electrical valve coming from teh right rear passenger side interior panel where the rear air handling stuff is located. It starts after teh engine is on and continues for a couple of minutesd then stops. It does this every time I stop and restart the engine. SOunds like a controller issue or a damper valve hanging up. Definitely sounds like an air pump-like thumping.

  • yadayada
    yadayada May 11, 2010

    Have a GM tech listen to the noise, this is a new one on me.

  • Robert Wright Oct 14, 2012

    I have a loud thumping noise sound when I turn on the heat which is coming from fron

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Hi, you should check if the blower plastic fan is rubbing against the fan housing ,they get lose with time and make those noises.good luck C1...

Posted on Nov 29, 2008

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