Auxiliary Air Conditioner: Service and Repair

WM 881019 Removing and installing auxiliary air-conditioning unit

Tools





Technical values






Preliminary work

1. Drain engine coolant. => 193817 Draining and topping up with coolant (includes bleeding) - section on "Draining"
2. Remove rear side trim panel. => 700319 Removing and installing side trim panel for rear luggage compartment - section on "Removing"

Removing auxiliary air-conditioning unit

Information

- For vehicles with four-zone air conditioning (2+2), the auxiliary air-conditioning unit is located behind the left rear side section cover for the auxiliary air-conditioning unit.





Overview of auxiliary air-conditioning unit

CAUTION

Danger of injury from contact with the refrigerant

-> Observe safety regulations when working with refrigerant. => 80 Safety regulations for working on air-conditioned vehicles and dealing with refrigerant R134a

1. Remove refrigerant by suction. => 870317 Adding refrigerant and removing by suction - section on "Draining"
2. Press together the air duct from above and pull out of the air-conditioning unit.





Pulling out the air duct from the air-conditioning unit

3. Press the release on the electrical plug -A- -arrow a- and pull off plugs -A- and -B-.





Disconnecting plug connections

4. Unscrew the fastening screws -1- and tilt the auxiliary air-conditioning unit inwards on the top side.





Tilting the auxiliary air-conditioning unit inwards

5. Press together the spring band clamps for the coolant hoses on the heat exchanger with the mounting pliers for spring band clamps, Cayenne hose connections 72-1 -arrows A- and pull off the coolant hoses from the heat exchanger -arrows B-.





Releasing and pulling off coolant hoses

6. Unscrew the fastening screw for the suction line in the upper bracket (not on the expansion valve at the bottom) -1-.





Loosening the suction line

7. Remove the suction line and close with plugs.
8. Unscrew the fastening screw for the pressure line in the upper bracket (not on the expansion valve at the bottom) -1-.





Unscrewing fastening screw and removing pressure lines

9. Remove the pressure line and seal with plugs.
10. Raise auxiliary air-conditioning unit and pull off water drain.





Raising auxiliary air-conditioning unit and pulling off water drain

11. First pull auxiliary air-conditioning unit inward -arrow- and pull out with the coolant hoses and the air-conditioning lines.





Removing auxiliary air-conditioning unit

Installing auxiliary air-conditioning unit

1. Position the auxiliary air-conditioning unit.





Running in auxiliary air-conditioning unit

2. Push the coolant hoses onto the heat exchanger -arrows A- and attach with the spring-band clamps -B-.





Connecting and fastening coolant hoses

3. Remove the plugs on the suction line and pressure line, check the O-rings of the refrigerant lines, and replace if in doubt.





Installing and screwing down the suction line and pressure line

4. Place the suction line and pressure line on the connection -arrow- and screw down the fastening screw -1-. => Tightening torque: 12 Nm (9.0 ftlb.)
5. Hold auxiliary air-conditioning unit and connect water drain. Ensure that the water drain remains connected to the drain when fitting the auxiliary air-conditioning unit.





Holding auxiliary air-conditioning unit and connecting water drain

6. Press the auxiliary air-conditioning unit on the side wall and screw down the three fastening screws -4-. => Tightening torque: 8 Nm (6.0 ftlb.)





Tightening fastening screws

7. Push on the electrical plug -A- and -B- until plug is felt to engage.





Connecting plug connections

8. Push the air duct into the auxiliary air-conditioning unit until the air duct engages.





Sliding air duct into the air-conditioning unit

Subsequent work

1. Fill in refrigerant. => 870317 Adding refrigerant and removing by suction - section on "Filling"
2. Top up engine coolant. => 193817 Draining and filling coolant (includes bleeding) - section on "Filling".
3. Install rear side trim panel. => 700319 Removing and installing side trim panel for rear luggage compartment - section on "Installing"
4. Install left rear wheel housing liner. => 536919 Removing and installing rear wheel housing liner - section on "Installing"
5. Install rear left wheel. => 440519 Removing and installing wheel - section on "Installing"