Heater Core: Service and Repair

HEATER CORE

REMOVAL

1. Disconnect the ground cable from battery.
2. Using the refrigerant recovery system, drain the refrigerant.
3. Drain the coolant from the radiator.
4. Remove the connector and bolts, and remove the expansion valve and AC pipes from the evaporator.
5. Loosen the heater hose clamps and remove the hoses.






6. Remove the instrument panel assembly.
7. Remove the heater and cooling unit.
1. Release the lock and remove the relay holder.
2. Remove the nuts, and remove the engine control module (ECM).






3. Remove the bolts and remove the heater and cooling unit.






8. Disconnect the claws and then remove the aspirator hose.






9. Remove the screws and remove the foot duct (LH).






10. Remove the heater core.
1. Remove the screw and remove the heater pipe clamp.






2. Pull out the heater core from the heater and cooling unit assembly.






INSTALLATION

CAUTION:
- Do not start the engine before charging refrigerant.
- If the engine is started with no refrigerant charge, replace the compressor.
- Replace O-rings and pipe clamps with new parts and install securely.

1. Install each part in the reverse order of removal.
2. Fill engine coolant.
3. Charge refrigerant.

Heater cooling unit:
Tightening torque:
T: 3.5 N.m (0.36 kgf.m, 2.6 ft.lb)

Blower motor unit:
Tightening torque:
T: 7.5 N.m (0.76 kgf.m, 5.5 ft.lb)