How to Evacuate the Car Air Conditioning System?
2 Answers
Methods for evacuating the car air conditioning system: 1. Connect the pipes: Attach the hoses of the car refrigerant recovery and charging machine to the high and low pressure pipes of the car air conditioning system—red for the high pressure pipe and blue for the low pressure pipe; 2. Power on and self-check: After turning on the refrigerant recovery and charging machine, it will undergo a self-check process; 3. Evacuation: Once the self-check is complete, follow the button prompts and screen instructions on the machine to perform the evacuation operation. After the evacuation is finished, you can directly add refrigerant. When adding refrigerant, set the charging capacity, time, and type on the refrigerant recovery and charging machine according to the maximum refrigerant capacity marked on the vehicle's air conditioning system. After confirmation, the machine will automatically start adding the refrigerant.
I've tried vacuuming my car's air conditioning system at home, and it was quite interesting. The main goal is to remove air and moisture from the system to prevent rust and reduced cooling efficiency. You'll need a vacuum pump and manifold gauge set. First, locate the high and low-pressure service ports on the AC system and connect your equipment. Turn on the pump to create a vacuum, waiting about 20 to 30 minutes until the gauge shows a stable negative pressure reading. After vacuuming, close the valves before turning off the pump, and check that the pressure doesn't rise back up - this indicates a good seal. I recommend doing this when the weather is cool, as high temperatures can affect the vacuum effectiveness. Only after completing this step should you add new refrigerant, otherwise residual air can corrode components and lead to insufficient cooling. Every time I finish this procedure, I always check the tool connections for any leaks to avoid wasted effort. After all, doing it right through DIY can really save you some repair costs.
