A8L Quattro Sedan V8-4.2L (AKB) (2002)
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Remove clamps -A- and -B-.
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Remove both coolant lines from heater core.
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Push both coolant lines in direction of "plenum chamber".
NOTE: Since the grommet in the area of passage of the coolant lines is slightly covered with silicone lubricant, the lines can be moved without
moving the grommet from the A/C housing.
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Remove bolts -C-.
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Remove bracket.
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Pull out heater core -D-.
Version "1 " heater core, installing
Installation is reverse of removal, noting the following:
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Before installing the heater core, check openings -A- of condensation water drain for soiling and clean if necessary.
NOTE:
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Condensation water drain valve must not be obstructed by wax or underbody sealer and must close properly.
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The drain openings in the illustration are depicted with the heater cores installed.
Cleaning:
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Removed: Reach through opening in the heater core and clean the condensation water drains, e.g. using wire.
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Heater core installed: Clean condensation water drains from the outside, e.g. using wire (with condensation water hose removed).