How Much Refrigerant Should Be Added to a Car's Air Conditioning System?

[PhoebeLee]

Before adding refrigerant, it is necessary to use a pressure/vacuum machine to pressurize the system and check for leaks. If leaks are found, components such as the air conditioning pipe joints, condenser, evaporator, dryer, compressor, and other parts of the air conditioning system must be inspected using foam water to locate the leaks for repair or replacement. After replacement, the system should be pressurized again to check for leaks. Only after confirming there are no leaks should the vacuum process be performed before adding refrigerant. Below are additional details on the refrigerant charging steps: Connect the refrigerant gauge to the air conditioning system (both high and low-pressure pipes), then proceed with vacuuming. Choose low-pressure vacuuming (rotate the switch corresponding to the low-pressure gauge counterclockwise, while keeping the high-pressure gauge switch closed). Generally, there is no need to monitor the negative pressure value during vacuuming; a 3-minute vacuum is sufficient. After the time is up, tighten the low-pressure gauge switch, and then connect the refrigerant canister for charging (again, do not touch the high-pressure switch, only open the low-pressure switch).