It looks like I lost all of the refrigerant due to a leaky schrader valve and O-ring. The A/C stopped cooling a few months ago, but I just got around to tracking down the problem.
Do I need to flush the system, replace the compressor oil, etc? Or can I just replace the leaky valve and o-ring and re-charge the system?
Some of the suggestions I've seen say to add 1-2 oz of compressor oil even if none has come out. Can the compressor oil be over filled?