A couple months back I had a leaking head gasket. It was replaced, then it blew out my front seal within minutes. After doing it a 2nd time, the mechanic told me I had crankwalk. They replaced 3 bearings (one being the thrust bearing), machined the crank, and replaced the seals. Car isn't leaking anymore and sounds normal.
Now my problem is with the A/C. The mechanic told me he had to evacuate the R134a and disconnect some A/C lines when he did the crank work. Since he doesn't have the necessary tools to deal with air conditioners, I had to take my car to another mechanic who checked for leaks, replaced two O-rings and both fittings on the lines. He recharged the system and gave me back the car. When he did, he told me the A/C compressor was failing. He said the compressor kept turning on & off so I should have it replaced.
I saw the clutch engage, then disengage several times before it would stop all together. I bought a used A/C compressor pulled from a 05 sebring with 47,000 miles. He installed it & gave me the car back.
I'm still experiencing the exact same problems. On a cold start, the compressor turns on and cold air starts coming out of the vents. After 2-3 minutes, the compressor turns off, then on again, off again, etc... Under the hood, I can see the clutch engage, then disengage several times before it just stops doing it's thing.
So two A/C compressors doing the exact same thing has me thinking my problem isn't with the compressor, but with something else. I checked the fan relays and they're fine.
I've already spent a buttload of money on this car and this A/C is just frustrating me now. Any ideas as to why it's not staying on?
No leaks, system is charged. Compressor works for only a few minutes on cold starts, then stops working. I've had the car for 3 years and the A/C had always worked fine. There was nothing wrong with it at all before the first mechanic disconnected some stuff to deal with the crankshaft issue.
Is there anything specific I should check? I'm hoping it's simply a bad sensor somewhere, but don't know what & where to check.