We recently did a service call for a local club in our area.The call was for not enough cold air coming from the vents. We put our gauges on the system and they had no superheat or subcooling. We evacuated the system but couldn't get all the refrigerant out of the compressor. The bottom of the compressor was all iced up. We finally were able to get it all out and bring the system into a vacuum, checked for leaks with nitrogen and a trace of r-22. We recharged system but could not get the superheat or subcooling to acceptable levels. Could the compressor be bad?