Method for Evacuating Car Air Conditioning System
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Method for evacuating car air conditioning system is as follows: 1. Connect the manifold gauge to the compressor and vacuum pump. 2. Open both high and low pressure valves. 3. After 10 minutes of vacuum operation, close both high/low pressure valves and turn off the vacuum pump. 4. The evacuation process is complete when low pressure stabilizes, then refrigerant can be recharged. The purposes of car AC system evacuation are: 1. Remove non-condensable gases from the system: These gases increase condensation pressure and discharge temperature, affecting cooling performance. 2. Eliminate moisture from the system: Reaction between lubricating oil and moisture produces acids that corrode the system and cause "copper plating" phenomenon, damaging the compressor.