Automotive vehicle A/C systems require maintenance. Maintenance includes refrigerant recovery, evacuation and recharging of the A/C system. Portable refrigerant recovery units are used in connection with this maintenance. The refrigerant recovery units connect to the A/C system of the automotive vehicle to recover refrigerant out of the system, separate out contaminants and oil, and recharge the system with additional refrigerant. During service it is desirable to recover, recycle or reclaim the refrigerant.