Thanks for the info- upon retesting with the valves on the gauges closed when the compressor came on the high side went to 125 and the low side went to negative 20-30….when I shut the compressor off and let the truck idle the high side retreated to 110 and the low side rose to over 75…the high side line from the orifice froze up the whole was to the evaporator and warmed up one the compressor was shut off.