The A/C pump went out on my '92 GMC 1-ton so I decided that it would be a good time to update it to 134a. Changed the pump, accumulator, and orifice tube, blew all the lines out and put in the new lube. Did not put the lube into the pump but into the low pressure line leading to the tube so it could ooze into it. Updated all fittings and charged it until ~320 pounds on the high side. The cooling works great but about every two days or so it will be running and then the compressor will shut off and the display will flash the A/C indicator at me. I can unhook the battery for a while and then it will function again for awhile. Is there a relay or something? Any ideas?