TT Quattro Coupe V6-3.2L (BHE) (2005)
Housing Assembly HVAC: Removal and Replacement
Heating And A/C Unit (With Heater Core And Evaporator), Removing And Installing
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Discharge refrigerant circuit
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Remove dust and pollen filter.
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Switch ignition on.
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Press "recirculated air" button on A/C control head -E87-.
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Wait until air flow flap -A- closes (fresh/recirculated air flap moves to "recirculated air" position).
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Switch off ignition with the air flow flap closed.
CAUTION:
Before beginning repairs on the electrical system:
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Obtain the anti-theft radio security code.
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On vehicles with electrically adjustable seats, move seats back as far as possible before disconnecting battery.
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Ignition OFF.
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Disconnect battery Ground (GND) strap.
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When the battery is reconnected, reset and check operation electrical equipment (radio, clock, convenience system if applicable
etc.) according to the Owner's Manual.
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Release pressure in cooling system by carefully and slowly opening cap on coolant expansion tank.
WARNING: The cooling system is pressurized when the engine is warm. Wear gloves, safety glasses and other protection, and carefully
release system pressure prior to proceeding with repairs.
NOTE: Depending on engine version, improved access may be obtained by removing front suspension cross brace.
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Using tools 3094, clamp off both coolant hoses for heater core at a point between the engine and connections -A-.
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Remove spring clamps -B- and detach coolant hoses.
NOTE:
Example illustrated: Heater core configuration without quick-connect coupling:
Coolant hose -C- = supply hose from cylinder head (marked with letter "V.
Coolant hose -D- = return hose to water pump (marked with letter "R")
Heater core/coolant flow direction configurations
NOTE:
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Depending on engine and heater core configuration, various coolant hose connection types with coolant flow direction are installed in production.