High Pitch squeal from belt area

[denali.FM]

I've got a 1998 K2500 with a 5.7 Vortec and there a high pitch squeal coming from the belt area. It mostly does it when the engine is warm but it doesn't do it all the time. The weird part about it is that the noise continues for a couple seconds after the engine has been shut off. Alternator has recently been replaced but it made the noise before and after replacing it.

Hopefully someone here can help me since it's super loud and really annoying.

 

[MYT HI]

I had a really loud squeal andnit turned out to be the belt. Worth a shot.

 

[96C1500]

Check all your pulleys too

Sent from my Vortec powered HTC One M8

 

[TrailBlazerZ71]

I had the same problem on mine. Replacing the belt did nothing. Turned out my a/c clutch bearing had gone bad. new compressor and problem solved.

 

[Mschaffer92]

Had the same issue, turned out to be a combination of a new belt and idler pulley

 

[TrailBlazerZ71]

So I think what we have established here is that your issue is somewhere on your accessory drive lol

 

[skylark]

Take the belt off and spin each pulley by hand. Feel for roughness and play. I don't think that you will find your problem there though in that you said that it makes the noise for a couple of seconds makes me think that the fan clutch is still spinning after shut down and that you will find a bad fan clutch.