Pulley Q's

[fushuman]

Hey guys,
well about 3 months ago, my belts were kinda worn out and I had a chirping noise when idling (sounded like a referee's whistle, mild but really annoying used )
So i changed both belts and the noise dissapeared. And two weeks later it came back

Now i'm guessing is one of the pulleys that might be worn out, well the problem is which pulley is the bad one? They all seem ok, none of the wiggle or shake or anything!! They all look fine. Is there some kind of technique to figure it out?

[Furious]

one of your idle pullys could be going out the door, and/or your tension pully. i had failure of both the top idle pully and the tension pully at once. what happened was the tension pully started to seize and thus the belt shredded the idler pully. so i changed the both the tension, and ilde pully as well as the belt.

[bitcore]

The AC compressor clutch is prone to wear out and cause a terrible screaching noise when it engages. Probably not your problem since the way you said it the noise seems constant.

[fushuman]

Well it seems to make more noise when i turn on the AC, but is there a way to find out which one is bad?

[bitcore]

Since the tension would be even tighter on the belt after the AC compressor's pully when the clutch kicks in, I'm guessing the culprit pully would probably be after the AC compresor's pulley.
Don't count on me though