How to Evacuate and Vacuum a Car Air Conditioning System?

[LorenzoMarie]

The following describes the method for evacuating and vacuuming a car air conditioning system: 1. Connect the high and low-pressure hoses to the compressor's high and low-pressure ports respectively, and connect the middle hose to the vacuum pump. 2. Open the high and low-pressure manual valves and start the vacuum pump: At this time, pay attention to the readings on the pressure gauge. The optimal vacuum reading should be between 98.7-99.9 kPa. 3. Close the high and low-pressure manual valves and observe whether the pressure gauge readings rebound: If the readings increase, it indicates a leak in the system, and the system should be repaired first. If the readings remain stable, reopen the high and low-pressure manual valves and continue vacuuming for approximately 15-30 minutes until the vacuum pressure gauge stabilizes. 4. Close the high and low-pressure manual valves and the vacuum pump: Pay attention to the sequence of closing—always close the high and low-pressure manual valves first, followed by the vacuum pump.