GM Repair Problems? Ask GM Repair Expert Now.
Hello I will help you with your question,
Have you ever added refrigerant to the system? Oil?
Did you add oil at the same time?
Unless the tensioner is AC Delco it may not have enough tension.
What happens is the compressor is mounted so low the oil can settle there causing "slugging" as it works through the compressor. Oil is not compressible so when it stalls the piston the compressor locks for an instant and either pulls the tensioner to its stop, throws the belt or breaks the belt.
I think first stop is pull all the refrigerant out and pull a good vacuum then refill with the exact charge by weight so you know how much is in there.
Once you have that done you can see if you still have the problem with the belt/tensioner/ At that point I would replace the tensioner at that time
The link here (click) explains more about this situation.
Please let me know how I can help
Glad to help, please let me know if you have further questions