How to Successfully Pull a Vacuum on an AC System and Improve Its Performance
To pull a vacuum on an AC system, you need to connect a vacuum pump to the system using hoses. Then, turn on the vacuum pump and run it until the pressure gauge reads below 500 microns for at least 30 minutes. This will remove all moisture, air, and other gases from the AC system. After finishing the vacuum process, close the manifold valves and disconnect the hoses from the AC system.