I've got a '90 325I convertible. The A/C hasn't worked since I got it back in March. When I press the A/C switch I hear it kick in and the engine accelerates. Watching the compressor, I can hear the clutch kick in and the center part starts to turn but ratchets and eventually stops rotating around except every once in awhile it'll turn a bit. I but a gage on the system and the pressure reads about 45PSI (it was already converted to 134 when I bought it). I've checked the pressure a few times and it is always at PSI with the A/C on high. Do I need to go and have the whole system evacuated and try re servicing it or is the compressor shot?
A/C Compressor Issue 
Linear Mode
