Q7 Quattro V6-3.6L (BHK) (2007)
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Pull coolant lines - B - and - C - out of heater core.
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Remove bolts - D -.
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Turn retaining pin - A - out of locking mechanism - B -
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Pull retaining pin - A - out of lower air duct - C - and heating & A/C unit - arrow -.
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Release catches - E - of lower air guide - C -
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Fold lower air duct - C - in direction of - arrow - - F - and remove lower air duct - C - and heater core.
Installing
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Clean front heating & A/C unit - D - and lower air duct - B - (e.g. of residual coolant).