Question about 2005 Chevrolet Trailblazer Ext
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."
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Posted on Jan 02, 2017
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