A8 Quattro Sedan V8-4.2L (AUX) (2001)
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Disconnect both coolant hoses from engine to pump valve unit (-A- and -B-) and mark installation position of hoses.
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Hold coolant hose -A- in a container.
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Remove plenum cover and cover for electronic box.
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Carefully blow coolant out of the pump valve unit and heater cores through the coolant hose -B- with compressed air.
NOTE:
Pinch off upper coolant hose to each of the two heater cores alternatively so that the coolant is blown out of both heater cores.
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Mark coolant hoses -A- and -B- and disconnect from the pump valve unit to the heater cores at the coolant hoses.
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Separate electrical connections to air conditioner housing (pay attention to Ground cable to A-pillar).
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Disconnect condensation drain hoses from air conditioner housing.
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Disconnect coolant hoses to the evaporator and seal.