AC Compressor

Don't go to a guy who has to cut the lines to get the motor out. Sounds like you need a new compressor and the expansion orifice tube at the very least, plus new AC lines. Get it to a good mechanic and be prepared to spend some money. Here are an estimator link and a directory link for you: https://repairpal.com/estimator/gmc/1500+pickup https://repairpal.com/gmc-repair-in-woodland-california