AC compressor failed after belt replaced. Failure was identified by knocking sound of the belt tensioner and occasional squealing of the belt whenever the compressor locked up. The new compressor failed too in less than 500 miles, even though all of the recommended additional AC system pieces had also been replaced. The parts dealer warranty covered replacement of the new compressor and subparts fortunately.
There seems to be some sort of belt tension device just to the right of the ac air compressor when you accelerate to wobbles and wines
I was told the whole air conditioning system had to be replaced by Russell Barnett GM dealer in Winchester Tennessee. Called GM to report this problem. GM made me think I was going to get reimbursed through the whole process but told me I had to go to a licensed GM dealer for the repair. I did, and when all was done they begged out. The GM dealership had my vehicle for a week???!!! Didn't know it would take that long to replace an air conditioning system. Very disappointing. I could have had it repaired in a day for half that by a licensed mechanic. At the same time I had a problem with my door locks. They wouldn't lock or un-lock off the door switch or key bobble. They said they put it on the diagnostics machine and it told them the locks were bad. They replaced all my door locks. Two days later while making my annual trip to Wisconsin the whole electrical system including the locks went out. Since I was in Wisconsin now I took it to the GM dealership there and found out there was nothing wrong with my locks and that it was the battery cables that went bad and that's what was causing the problem probably with both the lock and air conditioning. I spent mega $$$$ on locks and air conditioning. Kind of hard to trust some of the GM dealers in Tennessee. Thanks Bergstrom GM Wisconsin for not charging me and arm and leg to repair the cables. Everything has been working perfectly since.