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Dismantling and assembling air conditioner unit > < Removing

A4 Cabriolet Mk2

Installing
Installing
Install in reverse order, paying attention to the following:
–  Check all seals at air conditioner unit for damage prior to installation and replace damaged seals.
–  Check attachment of coolant pipes to heat exchanger.
   
–  Make sure coolant hoses are properly connected to heat exchanger. Heed markings:
A - Supply from cylinder head
B - Return to water pump
–  Re-install components removed (with the exception of driver's storage compartment) in reverse order.
–  Bleed coolant circuit → Engine, mechanics; Rep. Gr.19.
  Note
t  The arrangement of the coolant pipes to the heat exchanger of the air conditioner unit is such that the heat exchanger must also be bled. Proceed as follows:
t  - Bleed coolant circuit.
t  - Switch off ignition.
t  - Carefully open cap at coolant expansion tank (heed safety precautions for opening cap) → Engine, Mechanics; Rep. Gr.19.
  A87-0215
t  Unfasten clip at coolant hose -B-.
t  Slide back hose -B- until hole in hose is no longer sealed off by pipe.
t  Use cooling system tester -V.A.G 1274/- hand pump for example to increase pressure in coolant circuit.
t  Bleed heat exchanger by way of hose -B- until there are no bubbles in coolant emerging.
t  Attach coolant hose -B- and secure with clip.
t  Replenish coolant if necessary.
  A87-0215
–  Check coolant circuit for leaks, paying particular attention to connection between coolant pipes and heat exchanger. → Engine, mechanics; Rep. Gr.19
–  Re-install driver's storage compartment and remaining components removed.
–  Fit refrigerant pipes to evaporator → Chapter.
–  Check correct positioning of condensate drain hose → Chapter.
–  Evacuate and re-fill refrigerant circuit. → Air conditioner with refrigerant R134a
  Note
t  When installing dash panel, make sure intermediate defrost piece is properly positioned on air conditioner unit on insertion and that defroster vent does not squash intermediate piece on fitting.
t  After installing dash panel, check exit direction and distribution of air flow from defroster vent to windscreen.
  A87-0448

Dismantling and assembling air conditioner unit > < Removing