Can you damage an a/c compressor if you have overcharged the system. I used a sealer then recharged the 134a freon, A mechanic said charge until the air bubbles are gone from the glass. It did the job until I hit 4,000 rpm and the leak sealer blew or I blew the compressor, o ring or condenser. Can you test the compressor without removal, helpful info. would be welcome.