O-Ring Seals

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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 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 [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information)

NOTE:

The color coding of refrigerant circuit O-rings with R134a has been discontinued. Black and colored O-rings are used. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).