Heater Core: Service and Repair

Heating and A/C unit, assembly






Caution! Before beginning on the electrical system:
Ontain the anti-theft radio security code
Switch off all electrical consumers
Switch ignition off and remove ignition key
Disconnect negative (-) battery terminal
When disconnect and reconnecting battery terminals, observe all applicable notes and torque specifications, as well as instructions on performing OBD program and electrical system function checks as specified in Testing and Inspection - Procedures

NOTES: Before carrying out any work on the A/C refrigerant system, refer to all CAUTIONS, and WARNINGS in A/C refrigerant system safety measures
Service refrigerant system using Kent-Moore ACR 4 or equivalent
During servicing, all couplings, fittings, and related fasteners must be torqued to specifications

Removing

Refer to Heating and A/C Unit, Removing and Installing

Assembly

1. Heater core
Removing and installing, Fig. 1
Always use new coolant after replacement.

2. Housing, upper part

3. Evaporator
Attaching inlet/outlet seal, See Fig. 2
Installing seal, See Fig. 3

4. Housing, lower part
With fresh/recirculating air flap
With central air flap

Fig. 1 Heater core, removing and installing






Removing

- Prerequisite: heating and A/C unit removed
- Remove screws -1-
- Pull heater core up and out from housing -arrow-

Caution! In order to prevent damage to heater core, lift heater core only from areas indicated in grey

Installing

- Install in reverse order of removal

Note: Always use new coolant after replacement

Fig. 2 Evaporator inlet/outlet seal, attaching






- Evaporator inlet -B- and outlet -A- pipes are insulated between the halves of the housing with seal -C-.

Fig. 3 Evaporator seal, installing






- Foam seal -B- must must be glued around circumference of evaporator.
- To allow evaporator water to drain, do not attach foam seal on evaporator in area -C-.