A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Expansion Block/Orifice Tube: Service and Repair
Restrictor, Removing and Installing
Restrictor, Removing And Installing
NOTE: Yellow colored restrictors (diameter of bore/constriction 1.54 mm) were installed up to Model Year 2001. Red colored restrictors (diameter of
bore/constriction 1.42 mm) were introduced as of Model Year 2002. With this vehicle, the modification to the restrictor does not alter the refrigerant
R134a capacity. Refrigerant R134a - Servicing
Removing
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Discharge refrigerant circuit Refrigerant R134a - Servicing.
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Remove refrigerant line at threaded connection - A - (seal open connections).
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Use pointed-nose pliers to pull restrictor - B - out of refrigerant line.
Installing
NOTE: Only install restrictors of the same type. Restrictors of different color have different bore diameters. Refrigerant R134a - Servicing.
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Ensure correct positioning of restrictor - B - on installation (arrow on restrictor pointing towards evaporator).
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Restrictor must be snugly positioned in refrigerant line
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Check correct positioning of O-ring - C - (7.5 mm; 1.5 mm) in groove.
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Replace O-ring - D -.
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Check type of seal at connections and refrigerant lines (must be designed for same type of seal).
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Lubricate restrictor O-ring slightly with refrigerant oil before installing.
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Install refrigerant lines such that they are not strained.
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Tighten threaded connection - A - to 15 Nm.
NOTE: Check position of refrigerant lines after tightening threaded connection (lines must not make contact with other components).
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Evacuate and recharge refrigerant circuit. Refrigerant R134a - Servicing