this truck has been at 2 shops now ours, ac blows 80 deg, we replaced all hoses and lines, evaporator, condenser, dryer, orfice tube, expansion valve, compressor, flushed all, added oil and vacuum for 30 min, charged 2.8 lbs. at 1800 rpm blows 60deg air high side is 250 and low side 45 , at idle hig...