Heater Core: Service and Repair

WM 882319 Removing and installing heat exchanger

Tools





Technical values






Preliminary work

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

Removing heat exchanger





Overview of heat exchanger

1. Press together the air duct from above and pull out of the air-conditioning unit -arrow-.





Pulling out the air duct from the air-conditioning unit

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





Tilting the auxiliary air-conditioning unit inwards

3. Remove both servo motors for air flow. -> 882019 Removing and installing servo motor - section on "Removing" 882019 Removing and Installing Servo Motors
4. Press together the spring band clamps with the circlip 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

5. Unscrew fastening screws -2- and open the upper housing section -arrow A-.





Opening the upper housing section and removing the heat exchanger

6. Take out heat exchanger -arrow B-.

Installing heat exchanger

Information

- Both foam seals position the evaporator under a slight pre-load in the housing. To ensure the correct pre-load, any damaged foam seal must be replaced.

1. Insert heat exchanger into housing -arrow A-.





Installing heat exchanger and closing upper housing section

2. Fold up upper housing section -arrow B- and screw down with the fastening screws -2-. => Tightening torque: 1 ftlb.
3. Push the coolant hoses onto the heat exchanger -arrows A- and attach with the spring-band clamps -B-.





Connecting and fastening coolant hoses

4. Install both servo motors for air flow. -> 882019 Removing and installing servo motor - section on "Installing" 882019 Removing and Installing Servo Motors
5. Tilt in the auxiliary air-conditioning unit on the top side -arrows- and screw down with the fastening screws -1-. => Tightening torque: 6 ftlb.





Tilting the and screwing down auxiliary air-conditioning unit inwards

6. Push the air duct into the auxiliary air-conditioning unit -arrow- until the air duct is felt to engage.





Sliding air duct into the auxiliary air-conditioning unit

Subsequent work

1. Install rear side trim panel. -> 700319 Removing and installing side trim panel for rear luggage compartment - section on "installing" 700319 Removing and installing rear luggage compartment side-trim panel
2. Top up engine coolant. -> 193817 Draining and refilling coolant (includes bleeding) - section on "refilling" Service and Repair