S4 V8-4.2L (BHF) (2004)
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Remove bolts - A - and remove cover - B - from coolant lines.
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Protect floor covering beneath connections to heater core with absorbent paper.
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Loosen clips - A - and pull both coolant lines - B - and - C - out of heater core connections.
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Pull heater core - D - out of air conditioner.