So...... I think I'm married to this 2000 Silverado 1500, that belongs to my buddy ( guy bought the GTS ). It's been here for two weeks. Oil change and filters, drivers door motor and regulator, ALL new GM brake lines. A/C issues. He wants it working. Charged it last week, and it ran fine. Lost the charge after about 5 days. Trying to find leaks are tough on these. Added dye, looked for leaks, found none. Was worried about the evaporator being bad, cause you gotta pull the dash to get to it properly. Added some AC leak stop to it yesterday, thinking maybe an O ring or such. Sat overnight. My gauges said it lost some charge overnight. Finally saw a small leak at the high side charging port when I disconnect. So now, evacuate the system again. New valves are coming ( gonna change em both ). Vacuum system down AGAIN and introduce new R134 and pag oil. It just never ends with this Truck....