A6 Quattro Sedan V8-4.2L (BVJ) (2007)
A/C Coupler O-ring: Service and Repair
O-rings For Refrigerant Circuit
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O-rings are only ever to be used once and then replaced.
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Moisten O-rings with refrigerant oil before installing.
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Pay attention to correct positioning of O-rings on pipe or in groove.
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Ensure absolute cleanliness when working (even the slightest contamination, e.g. a single hair, could cause leakage).
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", "lilac" or "violet" ): Parts List
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Dimensions - a - and - b - differ depending on component location of O-ring: Parts List
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In addition to the colored O-rings, black O-rings are also used at the factory for certain connections.