A/C was cooling great and no funny noises until this morning. Had a noise tough to describe, then a thunk as the A/C belt popped off. It didn't break, just came off.
I'm thinking the tensioner may have crapped out, but I won't have any time to check it until maybe Tuesday; working anywhere from 12 to 14 hour shifts right now.
Are the tensioners a sore spot? Seems like I recall reading something about them a while back but can't remember if it was all LS's, or just LS1's (used to have one swapped into a 'burb so I had done some reading), etc.