A8L Quattro Sedan V8-4.2L (AKB) (2002)
Expansion Block/Orifice Tube: Service and Repair
Restrictor, removing and installing
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Remove plenum cover.
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Discharge A/C refrigerant system.
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Disconnect refrigerant line at the threaded connection -A-.
Tightening torque: 15 Nm (11 ft lb)
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Use needle-nose pliers to pull restrictor -B- out of the refrigerant line.
CAUTION!
Immediately plug open connections on A/C components and lines to prevent dirt and moisture contamination
NOTE:
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Install restrictor -B- the right way round (arrow on restrictor faces toward evaporator).
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Make sure O-ring -C- is correctly located in the groove.
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The restrictor must be seated free of play in the refrigerant line.
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Lubricate O-ring lightly (of restrictor) before installing in refrigerant line.
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Replace O-ring -D-.