Refrigerant Circuit Component Allocation, Influence On High And Low Pressure Sides: 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.

These rings seal off the connection points between individual components of the refrigerant circuit.

Fig 1: Checking O-Ring Seal Diameters

Courtesy of AUDI OF AMERICA, LLC

Only O-rings that are resistant to refrigerant R134a and the associated refrigerant oil may be used. Make sure they are original replacement parts.

O-Rings:

-- Always use only once.

-- Make sure diameters -a- and -b- are correct.

-- Coat with refrigerant oil before installing. Refer to Refrigerant Circuit (vehicle-specific repair information) and the Electronic Parts Information (ETKA).

NOTE:

The O-ring color coding for refrigerant circuits with R134a has been discontinued. Black and colored O-rings are used. Refer to Electronic Parts Information (ETKA) and Refrigerant Circuit (vehicle-specific repair information).