S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Check the connections in the expansion valve - B - and on the refrigerant line - D - for damage.
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Replace the quick acting coupling connectors on the refrigerant line with inner heat exchanger. Refer to => [ Disconnecting and Connecting
Refrigerant Lines, Quick-Release Couplings ] See: Compressor HVAC/Service and Repair/Disconnecting and Connecting Refrigerant Lines,
Quick-Release Couplings
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Replace the O-ring seals - A - and - C - version.
‹› Note the installation instructions for O-ring seals. Refer to => [ Refrigerant Circuit O-Ring Seals ] See: Description and Operation/Refrigerant
Circuit.
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Coat O-ring seals lightly with refrigerant oil before installing. Refer to => [ Refrigerant Circuit O-Ring Seals ] See: Description and
Operation/Refrigerant Circuit.
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Make sure the O-ring seals fit properly in the refrigerant line connection grooves and on the refrigerant line - D -.
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Tighten the bolts - E - for the refrigerant line - D - with inner heat exchanger.
‹› Tightening specification for the bolts - E -: 10 Nm.
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Tighten the nut - C - for the refrigerant line - B -.