76 Scamp A/C

Well, I guess that old RV-2 came back to life! If you are really getting 30 degree air out of the vents, the evaporator is going to freeze up. It's kind of hard to believe it's really getting that cold with only 12 oz. of R-134A. What are you measuring the vent temperatures with?

Did you put the EPR valve back in? If not you will need to put a cycling switch in to measure the evaporator temperature and cycle the compressor clutch to keep it from freezing up.