What is the refrigerant in the air conditioner called?

[DeFaith]

Refrigerant is also known as refrigeration working fluid. Here is an introduction to refrigerant: 1. In some southern regions, it is commonly known as "snow seed." It is a working substance that continuously circulates in the refrigeration system and achieves cooling through changes in its own state. 2. The refrigerant absorbs heat from the cooled medium (such as water or air) in the evaporator and vaporizes, then transfers the heat to the surrounding air or water in the condenser and condenses. Precautions for adding refrigerant to a car: 1. Before using the machine, the oil plug on the vacuum pump must be replaced, and the exhaust oil plug must be swapped out. 2. The vacuum gauge must not be subjected to high pressure. The vacuum gauge valve V3 must be closed before connecting the high and low-pressure pipes and adding refrigerant. 3. The force used to close the valves should be moderate. Tightening force should be minimized as much as possible without causing leaks to extend the service life of the valves. However, even if the sealing parts are damaged after long-term use, repair and replacement are very simple. 4. Pure refrigerant without solid impurities should be used. 5. All valves must be closed after the operation is completed.