The A/C compressor on our 2001 GMC is out again. The factory one ran for 10 years, no problem, always cold. Then out of the blue one day it blew out the compressor pressure switch on the back of the compressor. Replaced the switch, no luck, so I replaced the compressor and added switch (new compressor simply had a plug). Charged it up, ran great for a few days, then nothing but hot air again. Took it apart, and found the whole compressor seized up, switch blown out, and broken belt. I had good pressure, correct amount of oil, and everything, this is just driving me up the wall. I would greatly appreciate any thoughts as to what is going on, and especially if I can leave out that pressure sensor. My wife drives this 5 miles a day, no long trips.