A5 Quattro Coupe V6-3.2L (CALA) (2009)
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Clamp the coolant hoses - A - and - B - with hose clamps.
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Cover the area beneath connections for coolant hoses - A - and - B - e.g. with absorbent paper.
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Remove coolant hoses - A - and - B - from connections to A/C unit heat exchanger.
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Insert one section each of hose - A - and - B - on to both connections to heater core.
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Place a container - B - under the other end of the hose - C -.
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Using a compressed air gun - D -, carefully blow coolant out of heater core (into container - B -) via hose - A -.
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Remove the clamps - B - and - C - from the heat exchanger connectors - A -.
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Loosen both coolant pipes - D - and - E - from the heat exchanger connectors - A -.
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Remove the heat exchanger - A - in the direction of the arrow - arrow -.