I've been having a problem for months now. It started out with my alternator going bad. I replaced it. I still had a squeeling problem. So I replaced the idler pully. It continued. Replaced the belt. It continued. Replaced the belt tensioner pully. It stopped, until the car gets warm. Now when it gets warm it squeels. Like a slipping belt, if I apply soap to the belt it stops temporarily. It only does it at idle, at the moment, soon as I tap the gas. It stops immediatly when i tap the gas, soon as I release throttle, it starts.

What the heck is this???

what engine do you have ?

Sounds like you have replaced everything except the compressor clutch. Have you checked that?

I have whatever comes in the 98 fleetwood limited. It's a northstar.

How do I check the compressor clutch??

Take tension off the belt and spin the pully by hand. See if it makes any noise or feels rough. A stechescope would be a big help also.