2003 1500.......a/c quits

there are a couple of reasons for this to happen, one is the AC compressor clutch closing coil is defective and goes open, result compressor won't engage, the other is the low side pressure line cycling switch sticks.. there are many other less cmmon problems as well.sucha s switch problems and wiring issues, but GM AC systems are about the best there is.

try cleaning condensor and radiator with pressue washer(be careful no to bend fins)may haft to remove grill if they are dirty will cause ecessive high pressure in system triggering high pressure switch thats why compressor shuts down-if it didnt system would blow line or damage compressor-try that if it works keep clean on regular basis!!!Best of Luck To You!!!!