Question about 2004 Chevrolet TrailBlazer

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Squealing noise under the hood

Cannot pinpoint the noise. could it be the fan cluttch?

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I had the same problem, it turned out to be the idler pulley, a 16-20 dollar part. I took about 10 minutes to change myself but an auto shop will do it for 100-120 dollars.

Posted on Mar 08, 2009

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Squeaking belts can be too tight or too loose!
I've used a product called 'Belt Dressing' available at any Auto Parts Store to stop the squealing. Belt Dressing not only stops squealing but also reconditions old belts! Be careful as to not spray it on anything but the belt! Read the instructions completely before using any automotive product in a can!

I'd check the belts anyway or have them checked as squealing sometimes is a prelude to breaking!

Hope this has been helpful.

Good Luck!

Posted on Jan 24, 2009

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No, The fan clutch will not make a Noise it will just not catch the Fan to Cool. It is the Belt. Make sure that it is Tight. You may have a Bad Belt Tensioner if it is not.

Posted on Jan 23, 2009

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