A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
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A/C Coupler O-ring: Service and Repair
Refrigerant Circuit
Refrigerant Circuit O-Ring Seals
‹› Always use O-rings only once, replace.
‹› Coat the O-ring seals lightly with refrigerant oil before installing.
‹› Make sure O-rings are seated properly on pipe or in groove.
‹› Check the connections on the components and refrigerant lines for damage (even a small scratch can lead to leakage).
‹› Perform work free of contamination (even the smallest deposit e.g. a hair, may lead to a leak).
‹› Install only O-rings that are resistant to refrigerant R134a and corresponding refrigerant oil. These O-ring seals are color-coded to avoid mistakes
(currently " red", "light purple" and "dark purple").
‹› The O-ring dimensions - a - and - b - are different depending on installation location.
‹› In addition to the color-coded O-ring seals, use is also made at the factory of black O-ring seals for certain connections.
