R1234yf Refrigerant

In the EU, new car models have required a refrigerant with very low global warming potential since 2013 and all new cars since 2017, which led to the switch to R1234yf. It works at similar pressures to R134a but uses different service connections to prevent mixing. Some manufacturers use CO2 (R744) as an alternative in certain models, especially electric cars with heat pumps.

Like other refrigerants, it absorbs heat when it evaporates in the evaporator and releases heat when it condenses in the condenser.

The type and quantity of refrigerant are shown on a label under the bonnet; only that refrigerant should be used. Servicing requires suitable equipment and, in many countries, a certified technician because the gas is mildly flammable and regulated.