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George H.
George H., ASE Certified Technician
Category: GM
Satisfied Customers: 18443
Experience:  15+years ASE Master W/L1 Drivability
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My a/c belt on my '03 silverado broke and after replacement

Customer Question

My a/c belt on my '03 silverado broke and after replacement was thrown twice. I replaced the tensioner. Now when I turn the A/C on the tensioner is extremely loud. A/C works perfect in the cab.Why is the tensioner now clunking?
Submitted: 1 year ago.
Category: GM
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

Have you ever added refrigerant to the system? Oil?

Customer: replied 1 year ago.
added refrigerant in the beginning of the summer
Expert:  George H. replied 1 year ago.

Did you add oil at the same time?

Customer: replied 1 year ago.
No, only refrigerant. Used a/c pro and follow instructions to the T. This was atleast a month prior to my problem. Could the new tensioner be bad. The old one did not make any noise, the thrown belt was the only issue
Expert:  George H. replied 1 year ago.

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

Thank you

Customer: replied 1 year ago.
Thank you!
Expert:  George H. replied 1 year ago.

Glad to help, please let me know if you have further questions

Thank you