Refrigerant R134A: Notes
WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.
A/C systems in vehicles utilize the vaporization and condensation process. Thus one must work with a substance that boils easily, which is described here as refrigerant.
The refrigerant used is tetrafluoroethane R134a, which boils at -26.5 °C (-15.7 °F) at a vapor pressure of "1 bar (14.5 psi)" (absolute pressure corresponds approximately to the ambient pressure).