Question about 2005 Chevrolet Trailblazer Ext

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2005 Chevy trailblazer ext. engine whines constantly. Truck seems to operate fine, but the constant whining is annoying. What is it? Idler pulley was replaced a few years ago.

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  • David Burbee
    David Burbee Sep 29, 2010

    Hello! Purchase or borrow a stethoscope...Hold it against the alternator, power steering pump, and timing chain cover to isolate the noise...Then send a comment........Guru.....Saailer

  • lorna ffler
    lorna ffler Apr 15, 2014

    My dad (91y/o used to work on my cars not any more) suggested he do that...guess we will--& listen--Thanks!

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  • 1,190 Answers

If the whine changes with engine speed in park it could be the idler pulley again or the alternator or waterpump or the a/c compressor you can use a stethoscope or a long narrow screwdriver (2') and put it against a non rotating part and put your ear against the other end and where the noise is the loudest should be the suspect part. Be careful of the fan and belt when doing this.

Posted on Sep 29, 2010

Testimonial: "It was the idler pulley. Sorry it took so long for me to add this post. Thanks for your help."

  • lorna ffler
    lorna ffler Apr 15, 2014

    sond very much like my situation...idler pulley...hmm...expensive to have fixed?

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  • Master
  • 474 Answers

Sometimes when your altenator bearings are going bad they will make a whining noise, could also be power steering pump, try to see if you can isolate the noise to one or the other, is it louder on one side of the engine or the other side. That would help to narrow it down.

Posted on Sep 29, 2010

  • lorna ffler
    lorna ffler Apr 15, 2014

    sounds like same situation as mine...a guy heard it & mentioned power steering pump...expensive to have fixed??

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