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
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?