I had to replace an o-ring on my ac system (klima sanden conversion kit), when i did I replaced the dryer then vaccumed the system for a few hours and let it sit overnight. no leaks. I added three cans of r12 (system has not been converted) and all was working. According to the factory sticker and the weight on the cans I needed a fourth to get to the 1.3kg. So I added the fourth and drove a bit and all was ok. Today the compressor stopped coming on this afternoon. i hooked my gauges up to it and Im seeing 130 psi on the low side and 110 on the high side. What do you think is wrong, is it overcharged somehow? Ambient temp under the hood must be at least 110F. This is all with the engine off since I cant get the compressor to turn on.