Hi all, Havent been on in a while! I have a 2000 Silverado LS 5.3L with 95,000 miles. I started her up yesterday after work, and as I let her warm up, a squeal began from under the hood. It wasnt a belt squeal, but more like a metal on metal squeal. It quickly went away, but came back again a few minutes later. The squeal grew louder with engine RPMs. I got it to squeal while it was parked, and I could tell it was not a belt, but could not pinpoint the source (too high pitched!) It is now becoming more and more common. My guess is a bad bearing on one of my tensioner or idler pulleys. I figured I'd get some opinons from others before I rip the serpentine belt off and start checking pulleys. The last thing I want is a pulley seizing and a belt breaking. Losing power steering/brakes and alternator while doing city driving is not good Thanks guys.