I have an 03 silverado
5.3l v8. Ac problems. Last year, my compressor (I'm assuming) would cause my ac tensioner to knock and broke 2 belts. Assuming bad compressor, I left the belt of and dealt with the heat. This year, I tried again and put a new belt on. Knocking was gone. Freon was low and I unscrewed high side valve and it flew off. Realized I had a leak at the high side valve. I then changed the valve, orifice, and accumulator. Evacuated system with pump. System helda vacuum. Refilled freon (only one can put it in the green which according to autozone is way less than what the system should hold). Blew cold at idle. As soon as I drove off, it stopped blowing cold, only slightly cool. Clutch stays on as it should. The old orifice looked like it had metal dust on it. Could it be sensor or compressor? I have the dual manual climate controls inside. Also, my truck seems to be getting low on coolant lately. Not sure if that could be related. I don't have check engine light. Please help
I have seen this several times. The A/C compressor is bad. It may have also damaged the belt tensioner. The belt tensioner is causing the knocking noise. It may be hitting a transmission line also.
The problem in the compressor is what is called a wave plate. This is what controls the pressures. The pressures are getting too high causing the belt to knock since the compressor is almost locking up. Replace the A/C compressor.