Well, where to start? LoL I'm not even sure where to begin?! Short visit in hell, is what I relate this to. All I can say is that the tech had one single task and dropped and failed terribly. Mission was to vacuum the AC system, fill it with R-134a, let the system run a bit and that is it. It took over one hour to vacuum it. That part when well. Its when he so when to put the refrigerant, he did not put enough. Not enough pressure under 30 PSI, it does not trigger to activate the AC Compressor.