How to Pull Vacuum on Car AC Without a Pump: A Step-by-Step Guide
To pull a vacuum on a car AC without a pump, you will need a can of refrigerant with a built-in gauge and a charging hose. Start by connecting the charging hose to the low-pressure service port on the AC system. Next, turn on the car and the AC to maximum settings. Slowly open the valve on the can of refrigerant and allow it to flow into the system. As it does, the refrigerant will create a vacuum in the system, pulling out any air or moisture that may be present. Continue adding refrigerant until the gauge on the can indicates that the system is fully charged.