What does a car air conditioner need to be refilled with?

[LucasMarie]

The car air conditioner needs to be refilled with refrigerant, and the relevant information is as follows: Freon-12 (Code: R12): R12 is a halogenated derivative of alkanes, with the chemical name dichlorodifluoromethane. It is a medium-pressure, medium-temperature refrigerant widely used in small and medium-sized refrigeration systems. It is a colorless, transparent, odorless, almost non-toxic, non-flammable, non-explosive, and very safe refrigerant. R134A: R134A is widely used for initial installation in new refrigeration and air conditioning equipment and for replenishment during maintenance. It is currently the most widely used medium-low temperature environmentally friendly refrigerant. Its main characteristics are: it does not contain chlorine atoms; it has good safety performance; its physical properties are relatively close to those of CFC12, making it easier to retrofit refrigeration systems; its heat transfer performance is better than that of CFC12, significantly reducing the amount of refrigerant required. HFC134A has similar evaporation pressure to CFC12, with an ODP value of zero and a GWP value of only 0.29, and it has no significant toxicity.