Should Refrigerant Be Added to the Low-Pressure Pipe or High-Pressure Pipe in a Car's Air Conditioning System?

[StAyla]

"Refrigerant can be added to either the high-pressure pipe or the low-pressure pipe in a car's air conditioning system. There are two methods for adding refrigerant to a car's air conditioning: one is high-pressure side charging, which is suitable for charging after leak detection and vacuuming. Note that this method must not involve starting the compressor, and the engine must be off, with the refrigerant canister required to be inverted. The other method is low-pressure side charging, where gas is added. This method is characterized by a slower charging speed and is typically used for supplementing refrigerant. Since the high-pressure pipe is too dangerous, refrigerant is generally added from the low-pressure pipe, and the pressure must be monitored in real-time to avoid excessive pressure, which can easily damage the air conditioning system. Refrigerant can also be added to the high-pressure side when the engine is static. However, it is difficult to add refrigerant to the high-pressure side when the engine is running, so it is recommended to add refrigerant from the low-pressure side. Method and steps for adding refrigerant to the air conditioning system: Connect the refrigerant cylinder, repair gauge, and charging port with a charging hose, and remove the air from the hose. Start the compressor and use the pressure difference between the cylinder and the refrigeration system to charge refrigerant gas (if the refrigeration system has been pre-vacuumed, charge refrigerant gas first when the system is off. When the pressure gauge pointer no longer rises, start the machine to continue charging. Observe the changes in the pressure gauge pointer during the charging process. Maintain the pressure gauge pointer within the standard range marked on the air conditioning system by intermittently charging refrigerant. After running for a while, the air conditioner should exhibit the aforementioned normal operating state. After shutting down, use detergent to check all potential leak points."