How to Evacuate Air from a Car Air Conditioning System?

[McSophia]

Methods for evacuating air from a car air conditioning system: 1. Connect the high and low-pressure hoses of the manifold gauge to the high and low-pressure side valve ports respectively, and connect the center hose to the vacuum pump; 2. Open the high and low-pressure manual valves on the manifold gauge, start the vacuum pump, and observe the pointer on the low-pressure gauge (process gauge); 3. After continuous evacuation for 5 seconds, the low pressure should reach 0.03MPa (vacuum level), and the high pressure should be slightly below zero; 4. After the vacuum pump operates for 15 seconds, the low-pressure gauge pointer should be between 0.001 to 0.02MPa; 5. When the system pressure approaches a vacuum, close the high and low-pressure manual valves and maintain pressure for 5 to 10 seconds; 6. At the end of the evacuation process, first close the high and low-pressure manual valves, then shut off the vacuum valve system.