A8 Quattro Sedan V8-4.2L (BGK) (2006)
Heater Core: Service and Repair
Heating and A/C Unit Heat Exchangers, Removing and Installing
Heating And A/C Unit Heat Exchangers, Removing And Installing
Special tools, testers and other items required
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Hose clamps 3093/3094
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Commercially available compressed-air gun
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Cooling system tester V.A.G 1274 (and appropriate adapters)
Heat exchanger, preparation for removal
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Switch off ignition.
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Dissipate pressure in coolant circuit by opening cap at coolant expansion tank.
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Remove left and right plenum chamber covers.
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Detach Engine Control Module (ECM) and lid of electronics box.
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Unplug 2-pin connector from Coolant Pump - V50- of pump/valve unit.
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Mark positions of coolant hoses -A- (supply to pump/valve unit) and -B- (return to engine).
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Pinch off both coolant hoses from engine to pump/valve unit (using hose clamp V.A.G 3094 for example).
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Detach coolant hoses -A- and -B- from connections.
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Attach hose sections -A- and -B- to the two connections.
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Place collector -C- beneath hose -B-.
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Use hose clamp, for example, to pinch off return from heat exchanger on front passenger's side -D-.