Question about 2005 Chevrolet Trailblazer Ext

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2005 trailblazer makes real whiny sound when you step on gas the faster you go the louder it is, thought it was the power steering pump but still makes noise, can anyone help

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I had the same problem. the accessory pully under the alternator. a 15 dollar part and easy fix.

Posted on Jun 28, 2009

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Check the idler/tensioner pully's and the alternator pully, there is a common problem with one of these 3 going bad, usually an idler pully the best way to check is to get a mechanics stethescope and touch the end to the bolt on the idler pully's you will notice a very distinct sound difference from a smooth pully and one with bad bearings. gm tech here, seen many of these

Posted on Jun 19, 2009

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95% of the time on a trailblazer/envoy its the idler pulley under the alternator. It comes complete with the bracket from the dealer (about 30-45 depending on dealer). Take the 15mm bolt holding it to the bracket and just use the pulley. Loosen the belt with a 3/8 drive ratchet wrench and remove the 15mm bolt holding the pulley on and simply replace it.

Posted on Jul 24, 2009

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Power steering pump going bad low on fluid or alternator bearing worn.also transmission pump making whining noise.

Posted on Jul 24, 2009

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