Could it still be overfilled after the relief valve has opened? I could imagine it only relieved it to a maximum safe level in the lines not particularly the correct amount.

I did not get a very good observation of the noise the compressor made but it did not seem loud or grumbly at all. For the time it ran it appeared to run well until it popped the relief valve and let a bunch out.

this is not a salt area vehicle and I'm under the impression that it was severely overfilled to begin with. I am thinking that it is possible that the safety shutoff that keeps the compressor from kicking on during an overfill scenario is malfunctioning and that may have caused the overpressure in t...

I have found the high side port and there is still pressure and quite a bit of it inside of the line. Is this a good sign since both the port lines are holding pressure? Maybe i just need a professional vacuum and refill of the system?

I don’t have any service records of the ac. From what I have been able to agather the most common fix for the light on these cars is a low refrigerant charge however from the blowoff I would assume it was high.

are there pressure relief valves on car ac systems?

Brand new to the forum, how's it going everyone? I'll preface this with saying i have done quite a bit of my own mechanic work however ac is something i have never really gained a knowledge base on. I just JUST bought a 2007 impala and for the first week the ac worked great then after that the ac wo...