A8L V8-4.2L (BFM) (2004)
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Lower the engine carrier.
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Remove the coolant pipe bolt - arrow - from the oil pan.
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Remove the coolant pipe bolt - arrow - from the engine block.
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Drain the cooling system. Refer to => [ Draining and Filling ] See: Cooling System/Service and Repair/Procedures/Draining and Filling.
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Remove the bolts - 1 and 2 - and remove the coolant drain tube.