Volkswagen Tiguan Service and Repair Manual > A/C System, General Information: Refrigerant R134a
Refrigerant R134a Physical Data
Vehicle air conditioning systems make use of the vaporization and
condensation process. In this case, one works with a substance which boils
easily, designated as refrigerant.
The refrigerant employed is tetrafluoroethane R134a, which boils at -26.5 ºC
(-15.7 ºF) ...