O-Ring Seals

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Make exclusive use of seals which are resistant to refrigerant R134a and the related refrigerant oils. Color coding of O-rings is no longer employed. Colored and black O-rings are used.
Be sure to use seals with the correct inner diameter. Refer to the Parts Information and Refrigerant Circuit .

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