Should refrigerant be added to the high-pressure pipe or the low-pressure pipe in a car?

[DeDawson]

Refrigerant can be added to either the high-pressure pipe or the low-pressure pipe in a car's air conditioning system. Here are the relevant details: 1. Refrigerant: Commonly known as freon, refrigerant is the working fluid used in refrigeration and air conditioning systems to transfer heat and produce cooling effects. It can be classified by working method as primary or secondary refrigerant, and by material properties as natural or synthetic refrigerant. 2. Difference: During air conditioning cooling operation, the thin pipe is the high-pressure pipe while the thick pipe is the low-pressure pipe. The high-pressure pipe connects the compressor to the condenser, while the low-pressure pipe runs from the evaporator to the compressor.