S4 V8-4.2L (BHF) (2004)
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A/C Coupler O-ring: Service and Repair
O-ring Seals For Refrigerant Circuit
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Always replace, only to be used once.
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Moisten slightly with refrigerant oil before installing.
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Ensure correct positioning on line/in groove.
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Ensure cleanliness when working.
NOTE:
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Only O-rings which are resistant to refrigerant R134a and the corresponding refrigerant oil may be installed. Such O-rings are color coded to
prevent mix-ups (currently "red", "light purple" or "dark purple").
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In addition to the colored O-rings, black O-rings are also used at the factory for certain connections.
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Dimensions -a- and -b- differ depending on installation of O-ring.
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In January 2003, the connections between the refrigerant lines and the various components (condenser, evaporator etc.) were converted from
radial/axial sealing to radial sealing. It is only permissible to combine components with the same type of seal and the corresponding O-rings
(different versions). Reliable sealing of the joints cannot be ensured if components with different forms of sealing are installed.
