Refrigerant Circuit General Precautions: O-Rings

WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

Only use seals that are resistant to refrigerant R134a and the related refrigerant oils. Color coding of O-rings is no longer offered. Colored and black O-rings are used.
Be sure to use seals with the correct inner diameter. Refer to Electronic Parts Information (ETKA) and Refrigerant Circuit (vehicle-specific repair information).

The seals may be used only one time.
Coat the seals lightly with refrigerant oil (PAG oil) before installing.