Q7 Quattro V6-3.6L (BHK) (2007)
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Remove bolts - A - and disconnect refrigerant lines - B - and - C -.
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Mark the arrangement of coolant hoses - D - and - E - in retaining plate - F - and then remove them.
Installing
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Check seal on under side of retaining plate - F - for damage (seal at body) and install it (tightening torque of bolts 10 Nm).
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Replace O-ring seals on refrigerant lines to retaining plate (version Parts Catalog, installing
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Install refrigerant lines on retaining plate (tightening torque of bolts 10 Nm.
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Install refrigerant hoses - D - and - E - in retaining plate - F -, while doing this check for correct assignment and correct fit in retaining plate.
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Connect coolant hose - A - to coolant pipe - E - (coolant hose - B - is not connected for the time being).
NOTE: 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 25mm 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 VAG1274 enough that coolant can stream slowly into
heater core (to pre-bleed the heater core).
NOTE:
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By pre-bleeding the coolant circuit, bleeding of the cooling system after installation is greatly simplified on first starting in operation.
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Bleed coolant circuit
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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 coolant circuit.
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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. Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
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Check function of A/C system if necessary. Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.