S6 Quattro Sedan V10-5.2L (BXA) (2007)
Evaporator Core: Removal and Replacement
Evaporator
Special tools, testers and auxiliary items required
‹› Hose clamps up to 25 mm (3094) or hose clamps up to 40 mm (3093)
‹› Commercial compressed-air gun (with rubber end piece)
‹› Cooling system tester (V.A.G 1274) (and corresponding adapter)
‹› Heavy-duty gloves to protect against cuts
‹› Stable sharp knife with a tip (e.g. stable carpet knife)
Evaporator, Preparing for Removal
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Drain the refrigerant circuit.
‹› When the ignition is on, the valves of the pump/valve unit (Left Heat Regulation Valve (N175) and Right Heat Regulation Valve (N176)) are
continually activated depending on the temperature set at the Climatronic Control Module (J255) A/C control head. For this reason, the valve may
be warm or hot even when the engine is cold.
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Switch off ignition.
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Release pressure in cooling circuit by opening the cap on coolant expansion tank.
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Remove the plenum chamber cover.
CAUTION!
Even when the engine is cold, both pump/valve unit valves can be hot.
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Remove the windshield wiper arm, cowl panel trim, and complete windshield wiper
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If necessary, remove the dome brace (not present in all vehicles).
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Clamp off coolant hose - A - (return from the heat exchanger to the engine) e.g. using hose clamps up to 25 mm dia. (3094).
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Mark the assignment of coolant hoses - A - (supply to left heat exchanger) and - B - (supply to right heat exchanger).