Article: After you have let your vacuum run for a sufficient amount of time, close the valve that connects to the low-side gauge. Let your pump hold the vacuum for 15 minutes. If it’s not able to hold for that long, you likely have a leak and may need to replace components on your vacuum pump. When you are satisfied with how long your system held the vacuum, shut the pump off using the same switch mechanism you used to turn it on. Let your vacuum disengage completely before you disconnect the system. Once your vacuum has fully disengaged, you can disconnect the hose leading to the pump. Your AC system should be fully evacuated at this point, and ready to be recharged or repaired.
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Close the low-side valve and let the vacuum hold for 15 minutes. Shut off the vacuum pump. Disconnect your vacuum.