S6 Quattro Sedan V10-5.2L (BXA) (2007)
Expansion Block/Orifice Tube: Service and Repair
Restrictor, Removing And Installing
NOTE:
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This vehicle is only to be installed with a red colored restrictor (depending on manufacturer, color may also tend towards orange) Parts List and
Refrigerant R134a - Servicing.
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Differently colored replacement restrictors are available ( "yellow" restrictor, diameter of bore/constriction 1.54 mm; "red" restrictor, diameter of
bore/constriction 1.42 mm).Attention is therefore to be paid to assignment (different refrigerant circuit matching).
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There are different types of refrigerant pipe between evaporator and compressor/reservoir depending on vehicle model Parts List.
Removing
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Drain refrigerant circuit.
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Disconnect refrigerant pipe at screw connection - A - (seal open connections).
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Use pointed-nose pliers to pull restrictor - B - out of refrigerant pipe.
Installing
NOTE: Only install restrictors of same type. Restrictors of different color have different bore diameters Parts List.
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Check correct positioning of O-ring - C - (7.5 mm; 1.5 mm) in groove.
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Before installing, moisten O-ring (of restrictor and at screw connection) with a small quantity of refrigerant oil.
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Ensure correct positioning of restrictor - B - on installation (arrow on restrictor pointing towards evaporator).
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Check positioning of restrictor (snug fit in refrigerant pipe).
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Replace O-ring - D - ,version Parts List.
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Install refrigerant pipes such that they are not strained.
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Tighten screw connection - A - to 15 Nm.
NOTE: Check position of refrigerant pipes after tightening screw connection (pipes must not make contact with other components).
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Evacuate and refill refrigerant circuit.
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Check DTC memory of control and display unit, Climatronic Control Module J255 and erase any DTCs displayed "Guided Fault Finding"
function of Diagnostic operation system/Vehicle diagnosis service system VAS 5051 A/5052.