RS 6 V8-4.2L Turbo (BCY) (2003)
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Clamp off and disconnect both coolant hoses leading to heater core in air conditioner unit (e.g. using VAG 3094)
NOTE:
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The coolant hoses must be re-installed in the correct positions:
-- Coolant hose -A- supply from cylinder head.
-- Coolant hose -B- return to water pump.
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Bleed cooling circuit
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Place container under connection -A- and carefully blow out coolant from heater core (using compressed air) via connection -B-.
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Remove grommet -C-.
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Remove storage compartment on driver's side.
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Unscrew bolt -A- and remove bracket -B.
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Loosen clamp -C-.
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Pull heater core -D- out of air conditioner unit slightly.
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Pull two coolant lines -E- out of heater core.
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Remove heater core