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.
These rings seal off the connection points between individual components of the refrigerant circuit.
Only O-rings that are resistant to refrigerant R134a and refrigerant oil must be installed. Make sure they are original replacement parts.
O-ring seals:
-- Always use only once.
-- Make sure diameters -a and b- are correct.
-- Coat with refrigerant oil before installing. Refer to Refrigerant Circuit and the Parts Information.
NOTE:
The color coding of refrigerant circuit O-rings with R134a has been discontinued. Black and colored O-rings are used. Refer to the Parts Information and Refrigerant Circuit .