My Serpentine belt is squealing above idle

Sounds like the compressor is seizing up or a idler pulley bearing has failed.

start by getting a new belt.when you remove the old one make sure there is nothing loose.

You need to replace some other part like the automatic tensioner. What is the car doing? There is a factory repair for belt slip and squeal.

Just for testing, a few seconds, will the vehicle start and run w/o the belt? Have a helper work the throttle, is the sound gone? If problem not the belt, check the belt driven accessory. Sometimes you can use a long metal rod of some kind, with belt on, one end of the rod touches accessory housing, the other end goes on that bone behind your ear, helps to magnify the sound. I guess you could use a mechanics stethoscope to do the same thing. Have helper work the throttle while you listen to each. Don't get tool or anything caught in belt. This is a serpentine belt, I haven't looked?
Maybe an accessory trying to freeze up or bad bearing? I can't think of anything else at the moment?

have u checked the dampner pulley,it may b coming apart. if it only squeaks with the a/c on then it's your a/c clutch pulley.

the compressor is bad. make sure the radiator fan is running.

this could be the result of a few things.a belt thats too tght or too lose.there could be a bearing in the altenator going bad causing some grabbing on the belt.ther also could be an air compressor clutch beginning to freeze up.I hope this helps,

are you holding it at the end of the power steering travel? this can cause the squeal, also is the belt more than 30,000 miles old? is it an OEM belt.

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!

Are you sure you don't hear anything like a chirping sound when the engine is idling? Have you popped the hood and listened while the engine was idling? Have a friend sit in the driver's seat while you pop the hood, tell them to press the accelerator and then listen for the squeal. I would bet dollars to donuts the problem is the serpentine belt is worn and needs to be replaced.