Q7 Quattro V8-4.2L (BAR) (2008)
‹› Connect coolant hoses on proper side, coolant hose - A - supply from engine (via pipe group under left fender) and coolant hose - B - return to
engine (via pipe group under left fender).
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Fill coolant into coolant expansion tank up to top marking.
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Extend coolant hose - B - and hold it in such a way that it ends approximately at the height of the heater core.
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Open hose clamps up to 25 mm dia. (3094) on coolant hose - B -.
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Increase pressure in coolant expansion tank e.g. using hand pump of cooling system tester (V.A.G 1274) enough that coolant can stream slowly
into heater core (to pre-bleed the heater core).
‹› By pre-bleeding the cooling circuit, bleeding of the cooling system after installation is greatly simplified on first starting in operation => [ Cooling
Circuit, Bleeding ] See: Heating and Air Conditioning/Service and Repair/Procedures/Cooling Circuit, Bleeding.
‹› Bleed cooling circuit => [ Cooling Circuit, Bleeding ] See: Heating and Air Conditioning/Service and Repair/Procedures/Cooling Circuit,
Bleeding.
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Wait until coolant exits from extension for coolant hose - B -.
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Clamp off coolant hose - B - again using hose clamps up to 25 mm dia. (3094).
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Release positive pressure in coolant expansion tank (remove hand pump).
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Connect coolant hose - B - to coolant pipe - F -.
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Install the removed components again in reverse order.
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Evacuate refrigerant circuit and recharge again.
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Bleed cooling circuit => [ Cooling Circuit, Bleeding ] See: Heating and Air Conditioning/Service and Repair/Procedures/Cooling Circuit,
Bleeding.
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Check DTC memory of front A/C control head Climatronic Control Module (J255) and of Rear A/C Control Head (Climatronic) (E265) and erase
DTCs displayed if necessary.
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Check function of A/C system if necessary.