Refrigerant Circuit, Filling With Other Refrigerants
WARNING: This page is about a different car, the 2022 Volkswagen ID.4 and 2021 Volkswagen ID.4. However, it is still accessible from the selected car via links, so may be relevant.
A/C systems that were developed and designed for refrigerant R744 must not be filled with any other refrigerant, such as R134a or R1234yf.