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You need to remove the serpentine belt, And then start engine and see if the noise goes away with the belt off. That will eliminate all the things that the belt runs. If your noise is still there with the belt off, then ask your question again saying that you have removed the belt and you have a high pitch screeching sound. Then wi'll see what we can do for you.
you have a small cat stuck under your car
Remove the serpentine belt and check the belt and pulleys for damage. While the belt is off, turn the alternator by hand listening for the noise.
Assuming it is screeching in the area of the belt and pulleys, my problem was that the belt tensioner had seized and needed to be replaced. Noise problem was solved.
usually it is a loose belt
good chance the fan belt is slipping when driving may need tightning up this wouold cause a screeching noise.
One of the earliest signs of a bad serpentine belt is strange noises. You will often hear a screeching sound. You could also hear a grinding sound coming from under the hood. These sounds may come and go at first and then become more persistent and regular.
Spray hairspray on the belt if it is making the noise or replace the belt or the pulley if its making the noise.
A slipping drive belt is one possibility.
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The belt is slipping.
you have a stuck valve