I have a 2001 pontiac grand prix gt and it makes a squealing noise, and when i accelerate it gets louder and more whiny. I have replaced the belt and it still makes the noise. If the car is started and not moving and you turn the wheels it makes the whining noise also. Any answers?

How To Fix Alternator Whine Or Belt Squeal Engine Noise ...

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Oct 25, 2012 - Uploaded by dbradley3 Fix details explained in video audio on persistent squeaking fix for a GM L36 3800 Series II Engine; this is a ..

Check your power steering fluid , or you serpentine belt an tensioner !

check your belts for cracks replace if cracked or not plyable

The engine serpentine belt may be worn or wet. The belt slips, causing a high pitched squealing or whistle noise. The other possiblility is a bearing beginning to go out on one of your belt driven components

its the rod bearing mines doing it rite now easy solution new motor

more likely a wheel bearing jack up each wheel and check for play,

your car is back fireing.try tune up or timeing belt jumped. get it check out soon

It appears that either the new tensioner or some other pulley is NOT lined up properly. Check to make sure all pulleys are in alignment.

I would start with a belt. While removing it feel how much tension the tensioner has on it, on the 3800 egnine they have a stiff tensioner(sorry I don't have any specs for how much) After you get the belt off you can look at all of the pulleys and spin them to see if the bind or look for stuff stuck in the grooves on the pulleys.
It sounds to me like the belt is streched. I would not recommend one of those gator back belts, they seem to make more noise sooner than a good v notch belt. But thats just my opinion!

check your belt tension. Tighten it up and the noise should go away. if not, replace the belt and tension it accordingly.