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How to Add Refrigerant Oil to a Car Air Conditioner?

1 Answers

VanEmery

07/25/25 9:08am

There are two methods for adding refrigerant oil: the direct pouring method and the vacuum suction method. Below are the detailed instructions: Direct Pouring Method: Pour the refrigerant oil into a clean measuring bottle, then directly pour it into the compressor's plug port. This method is suitable when replacing the evaporator, condenser, or receiver-drier. Vacuum Suction Method: 1. First, evacuate the system to 100kPa. 2. Prepare a graduated measuring cup and fill it with slightly more refrigerant oil than the required amount. 3. Close the high-pressure manual valve and the auxiliary valve, then disconnect one end of the high-pressure hose from the manifold gauge set and insert it into the measuring cup. 4. Open the auxiliary valve, and the oil will be drawn into the system from the measuring cup. 5. When the oil level reaches the specified mark, immediately close the auxiliary valve. 6. Reconnect the hose to the manifold gauge set, open the high-pressure manual valve, start the vacuum pump, first evacuate the high-pressure hose, then open the auxiliary valve to evacuate the system.

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