Originally the compressor was faulty(why i can't remember) but we changed out compressor and accumulator and orifice tube and flushed complete system(lines and cores with zep ac flush) - i recall the orifice was plugged - off and on over the last few years we have done some servicing on it... lines,...

I know this is an Auto AC forum but.... I have been working on an MT745 CAT Challenger and am at my wits end with it... a little background.. I have replaced compressor, accumulator, orifice tube - flushed out complete system - new thermostatic switch and low pressure cycling switch... ended up chan...