A4 V6-3.0L (AVK) (2004)
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Remove screws -A- and remove cover -B- from coolant lines.
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Cover carpet beneath heater core connection with absorbent paper.
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Loosen clamps -A- and pull out both coolant lines -B- and -C- from heater core connections.
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Pull heater core -D- out of air conditioner.
Installing
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With the heater core removed, check air conditioner for soiling (via heater core opening).
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If necessary remove dirt or coolant from air conditioner unit (for example after removing leaky heater core).
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Check seals -A-, -B- and -C- on heater core, only install heater core with good seals.