how to recover refrigerant from a car make sure there is no refrigerant in the pipes before you connect them to the car this can be checked by looking at the gauges on the machine the gauges must show zero if not press recovery and press all when machine finishes cleaning the pipes connect the low side coupler to the low side service port and connect the high side coupler to the high side service port press recovery the screen will show all open high and low valves on the machine press start and recover all when the machine has finished recovery the screen will show the net amount of refrigerant recovered during recovery the machine will do oil recovery and oil separation the waste oil recovered can also be noted in the waste oil bottle at the back of the machine and also displayed on the front screen the machine at this point will do a recovery test for two minutes to make sure there is no refrigerant left in the pipes the machine cannot perform a vacuum function if there is refrigerant in the pipes you