Seat Leon >> Removing and installing heater and air conditioning unit

WARNING

Danger from refrigerant escaping under pressure! Freezing of skin and other body parts.

  • Evacuate the refrigerant and then open the refrigerant circuit immediately.
  • If more than 10 minutes have elapsed since evacuation and the coolant circuit has not been opened, evacuate the refrigerant again. Pressure builds up in the coolant circuit as a result of secondary evaporation.

Special tools and workshop equipment required

  • Hose clamps, up to 25 mm - 3094-
  • Engine bung set - VAS 6122-
  • Commercially available compressed-air gun

Removal:

  • Turn off the ignition and all electricity consumers.

Vehicles without access and start authorisation system

  • Remove ignition key, if fitted.

Vehicles with access and start authorisation system

  • Store ignition key outside the vehicle to prevent the ignition from being switched on unintentionally.

Continued for all vehicles

  • Disconnect battery.
WARNING

Hot steam/hot coolant can escape - risk of scalding.

  • The cooling system is under pressure when the engine is hot.
  • Cover filler cap on expansion tank with a cloth and open carefully to release pressure.

Open cap -arrow- on coolant expansion tank.

Vehicles with air conditioner

  • Extract refrigerant.
  • Detaching refrigerant pipe with internal heat exchanger from mount on the expansion valve.

Continue for all vehicles

  • Mark installation position of coolant hoses -1- and -4-.

Note The heat exchanger is designed for a certain coolant flow direction.

The coolant hoses must therefore be connected on the correct sides.

  • Pinch off the coolant hoses with hose clamps -3094- .
  • Lift the fasteners -2, 3- and detach the coolant hoses from the heating system heat exchanger.

Air conditioning system

  • Fit a short hose -A- to the upper connection.
  • Insert the compressed air gun in the end of the hose.
  • Hold a collector -B- under the lower connection -C- and use the compressed air gun to carefully blow the coolant out of the heat exchanger.
  • Seal open lines and connections with clean plugs from the Engine sealing plug set - VAS 6122- .

Remove dash panel.

  • Remove the rear footwell vent.
  • If fitted: Remove the rear vent air duct .
  • Unplug the connector -3- at the fresh air blower -1-.
  • Place absorbent paper over the floor covering beneath the heater and air conditioning unit.
WARNING

Risk of airbag control unit malfunctioning due to corrosion in connector.

  • After unplugging, cover or seal off the airbag control unit connector to prevent the ingress of moisture.

Air conditioning system

  • Detach the condensation drain -2- from the heater and air conditioning unit -1-.
  • Lay bare the duct -3-.

  • Lay bare the wiring harness -2- at the mounts -4- -arrows-.

Note Do not remove the carrier for the onboard supply control unit - J519- and associated components: Onboard supply control unit - J519- , fuse boxC-SC-, control unit for parking aid - J446- , warning buzzer for front parking aid - H22- . The components mentioned may differ from one another depending on the vehicle fittings.

Air conditioning system

  • Remove dash panel cross member.
  • Unscrew the threaded locating pin on the left side of the cross member.
  • Displace the dash panel cross member towards the back.
  • Remove the heating and air conditioning unit -1- to right.

Installing

Install in reverse order of removal; note the following.

  • Fill coolant.
  • Vehicles with climate control: Fill refrigerant and refrigerant oil.
    Removing and installing supplementary air heater element - Z35-
    Removal: Turn off the ignition and all electricity consumers. Vehicles without access and start authorisation system Remove ignition key, if fitted. Vehicles with access and start author ...

    Removing and installing holder for heater and air conditioning unit
    Note Leave the holders in the vehicle on removing the heater and air conditioning unit. Removal: Turn off the ignition and all electricity consumers. Vehicles without access and start author ...

    See also:

    Adjusting door
    Special tools and workshop equipment required Torque wrench - V.A.G 1331- Adjustment gauges - 3371- Back door adjustment (hinges on pillar) Note The door can be adjusted back and fo ...