Should Car Air Conditioning Refrigerant Be Added from the Low or High Pressure Side?

1 Answers
BrooklynLee
07/30/25 10:40am
Car air conditioning refrigerant should be added from the low pressure side because the system is vacuumed, and the high pressure side is only suitable for adding refrigerant as it retains an interface. The method of addition depends on the substance being added. Here are more details about adding refrigerant from the low pressure side: 1. First, connect the manifold pressure gauge to the compressor and the refrigerant canister. After opening the canister, loosen the nut on the middle injection tube of the pressure gauge. When you hear the sound of refrigerant vapor flowing, tighten the nut. 2. Next, open the low pressure manual valve, allowing the refrigerant to enter the refrigeration system. When the system pressure reaches the specified value, close the low pressure manual valve. 3. Finally, start the engine and turn on the car air conditioning to allow the refrigerant to enter the refrigeration system, and then test the cooling effect.
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