Loose Pulley

I'm pretty sure it's the AC pulley. I'm looking at shoebox's views right now, but I'm on 56k, so it's kinda slow. It's the one directly under the altenator. It's loose, and shaking and making this horrible screeching noise at idle that goes away when I drive around and the rpms are higher. I thought it was the belt, but I saw the pulley shaking today. Can I just tighten it down? That would be too easy I guess. How about taking off just the pulley and replacing it or the bearings in it? Is it a seperate piece from the compressor? That would probably be too easy as well... I need your ideas and suggestions please. Thanks.

directly below the ALT? is the pulley grooved or smooth?

grooved, it's the one below the smooth pulley. looks like there's a bracket in front of it that's not moving.

is it the power steering pulley? anyone know how to fix it?

umm., the grooved one below the smooth one is A/C compressor, the smooth one is the PS pump

ok, is it all one piece or what?

ok, is it all one piece or what?
which one?

the ac compressor? how can i fix it? can you just replace the clutch and that's it? do you have to bleed the entire system and recharge it too?

you can replace just the clutch/pulley, you can get the parts from the dealer or aftermarket, IIRC, you need a special tool to remove the clutch hub, and snap ring pliers to remove the pulley

ok, thanks. where's the best and cheapest place to get one? should I only get GM or is aftermarket ok too?

Does anyone have a write up or directions to replace the clutch/coil? How about part numbers?