A4 Sedan L4-2.0L Turbo (BPG) (2005)
Housing Assembly HVAC: Service and Repair
Heating and A/C Unit, Removing and Installing
Special Tools And Equipment
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Hose Clamps, Up To 40 mm. 3093 or Hose Clamps Up To 25mm Dia. 3094
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Commercially available compressed-air gun
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Cooling system tester V.A.G 1274/ (with hand pump and appropriate adapters)
Removing
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Remove plenum chamber cover.
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Discharge refrigerant circuit Refrigerant R134a - Servicing.
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Disconnect and remove Battery A.
NOTE:
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If necessary, obtain radio anti-theft code before disconnecting Battery A.
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On vehicles with electrically adjustable seats, move seats to rearmost position before disconnecting Battery A.
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On removal, note down bolt lengths and assignment for reinstallation.
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All cable ties and other wiring harness fasteners released or cut open on removing air conditioner are to be reinstalled in same position on
installation.
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Dissipate pressure in coolant circuit by opening cap at coolant reservoir.
CAUTION: On vehicles equipped with Audi Telematics by OnStar, switch-off the emergency (back-up) battery for the Telematic/Telephone
Control Module prior to disconnecting the vehicle battery. Switch-on the emergency (back-up) battery after reconnecting the vehicle battery
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Mark positions of coolant hoses - A - and - B -.
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Pinch off both coolant hoses to heater core of air conditioner (e.g. using Hose Clamps Up To 25mm Dia. 3094) and remove hoses.
NOTE:
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Make sure coolant hoses are correctly connected:
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Coolant hose -A- supply from cylinder head
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Coolant hose - B - return to water pump
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Bleeding coolant circuit Engine Mechanical
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Place container beneath connection - A -.
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Install section of tubing to connection - B - and use a compressed-air gun to carefully blow the coolant out of the heater core (into the container).
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Remove grommet - C -.