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Engine makes squeaking nosie under the hood. its a 4.3 ltr

(2004 GMC Sierra 1500)
in Killeen, TX on September 24, 2011
have replace the following parts already, serp-belt, belt tensioner assy, idler pully, and alternator and it still makes alot of squeaking noise when on higher rpm, more so when the AC is on. what could be a possible problem?
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Popular Answer
on September 25, 2011
Take the belt back off and see if the noise is still there when start the engine. I found a pesky water pump front bearing noise when I did this on a vehicle. You can turn the individual components by hand and see what you feel or hear.
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