Should Freon be added to the car air conditioning system from the low-pressure or high-pressure side?

[DelJoy]

Freon can be added from either the low-pressure or high-pressure side. More information about adding Freon to car air conditioning systems is as follows: 1. There are two methods for adding Freon to car air conditioning systems. High-pressure side filling: Suitable for filling after leak detection and vacuuming, the compressor must not be turned on, the engine must be stopped, and the refrigerant tank must be inverted; Low-pressure side filling: Gas is added, characterized by slow filling speed, usually suitable for supplementing refrigerant. 2. After filling is completed, close the low-pressure manual valve on the manifold pressure gauge and the injection valve on the refrigerant tank, stop the engine, and quickly remove the manifold pressure gauge from the compressor to avoid excessive refrigerant leakage.