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Mine isn't squeaking. Yours is because your pulleys aren't aligned or because you are using an improper belt.
Belt dressing if the belt is in good condition. Make sure that it is not a pulley squeaking and if the belt is in bad shape replace it.
the most likely cause would be an improperly tensioned serpentine belt
A squeaking belt on a 1999 Grand Am is often caused by wear and tear, misalignment, or improper tension of the serpentine belt. It could also indicate a problem with one of the belt-driven accessories, such as the alternator or power steering pump. Inspect the belt for cracks or fraying, and check the tensioner for proper function. Replacing the belt or adjusting the tensioner should resolve the squeaking issue.
it´s possible that a bad hydraulic lifter is working dry.
don't know about belt; but the noise might be water pump or AC compressor (if installed). Mine has same. hi there mate I'm a Toyota tech. you need a need belt and tensioner its hydrolic therefore not adjustable.
Spray hairspray on the belt if it is making the noise or replace the belt or the pulley if its making the noise.
The belt is slipping.
Most likely the power steering belt is old and should be replaced.
If it's a "chirping" noise, then you don't have the belt tight enough.
Sometimes squeaky noises can be a result of a damaged belt. When you speed up, the noise goes away. You should get your car inspected by a mechanic.
Alternator belt in need of Tightening is One Squeaking Noise.