A8L V8-4.2L (BFM) (2004)
Heater Core Case: Service and Repair
Heat Exchanger
=> [ Preparation for Heat Exchanger Removal ]
=> [ Right Heat Exchanger ]
=> [ Left Heat Exchanger ]
=> [ Rear Footwell Heater ]
Preparation for Heat Exchanger Removal
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Switch off ignition.
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Release pressure in cooling circuit by opening cap on coolant expansion tank.
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Remove left and right plenum chamber covers.
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Remove the engine control module and the E-box cover.
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Disconnect 2-pin connector from Coolant Pump (V50) of pump valve unit. Refer to => [ Pump Valve Unit, Checking ] See: Heater Control
Valve/Testing and Inspection/Pump Valve Unit, Checking.
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Mark the arrangement of coolant hoses - A - supply to pump valve unit and - B - return to engine.
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Clamp off two coolant hoses from engine to pump valve unit using Hose Clamps (V.A.G 3094).
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Remove coolant hoses - A - and - B - from connections.
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Connect one hose piece - A - and - B - to each of two connections.