AC Compressor noises

I have a squeal(best way to describe the noise) coming from my compressor pulley. Sprayed it down with some liquid wrench and the noise lessened. Seems like the pulley was about to seize up so i sprayed it to prevent total carnage in the engine. Is this a common occurance. What am i looking at here. I made an appt with the stealership to have them check it out. Is it just a lube job, can i do this myself? BTW, the ac works just fine.

97 xj, 4-oh.

Any help greatly appreciated....

Are you sure it's not the BELT squealing? An AC compressor puts a hell of a load on a belt. I would bet on belt squeal first. Do this: while the belt is squealing, pour some PLAIN WATER on the belt. If the squealing stops, it's a belt related noise, and you either need to tighten the belt, or replace it.