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it could be the idler puller rubbing on the bearings. we had to replace it on our 2006 Chevy trailblazer ext.

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Q: 2003 trailblazer making whistling noise toward center of engine?
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2005 4WD Trailblazer started making a high pitched whine that gets louder as you accelerate the noise is definitely coming from the engine you have been told it could be the idler pulley bearing?

It could be, try shooting it with some wd40 and if it changes pitch or stops it probably is.