I normally don't touch AC systems, but long story short, shop wanted $1000 to replace compressor and condenser when the only part that had failed was the compressor clutch. I replaced it myself and it's working great. My wife's cousin was over today as I was working on my wife's car and said her AC hasn't been working for quite some time. I hooked up the AC manifold I had purchased and the high pressure side was 150psi, but the low pressure side was 350psi. I was stumped and doubled checked to make sure everything was connected properly. It was about 108 degrees today. The compressor doesn't come on, fuse and relay seem okay, tested the compressor clutch coil for continuity and its okay. I asked if she had ever had it recharged, thinking someone may have added too much, and she said no. What on earth could cause such a high reading on the low side? Maybe the previous owner added some refridgerant?