O-Ring Seals

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2016 Audi A4, 2015 Audi S4, and 2015 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 OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

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