Heater Core: Service and Repair

Heater Core

REMOVAL

1. Disconnect the ground cable from battery.
2. Using the refrigerant recovery system, discharge refrigerant.
3. Drain the coolant from the radiator.
4. Remove the intake boot.

CAUTION: Move aside the intake boot to perform the operation without disconnecting the PCV hose.

5. Remove the bolt, and remove the hose - pressure suction and the pipe - evaporator cooling from the expansion valve - cooling.
6. Loosen the heater hose clamps and remove the hoses.






7. Remove the instrument panel assembly.
8. Remove the engine control module (ECM).
1. Release the lock and remove the relay holder.
2. Remove the nuts (a).
3. Loosen the nut (b), and remove the engine control module (ECM).






9. Remove the blower motor unit assembly.
1. Disconnect the blower motor relay and each connector.






2. Remove the bolts and nuts to remove blower motor unit assembly.






10. Remove the heater and cooling unit assembly.
1. Disconnect each connector and the hose - drain.






2. Remove the bolt and nuts, and remove the heater & cooling unit assembly.






11. Remove the heater core.
1. Remove the screw and detach the clamp - pipe.






2. Remove the screws and detach the cover - heater pipe.






3. Remove the clamp, and remove the pipe - inlet and outlet.






4. Remove the screws and detach the plate - heater core.






5. Pull out the heater core from the case - heater unit.






INSTALLATION

CAUTION: Replace O-rings and clamps with new parts and install securely.

1. Install each part in the reverse order of removal.

NOTE: Refer to "INSTALLATION" of "Instrument Panel Assembly".

Tightening torque:

Heater cooling unit:
T1: 5.0 N.m (0.51 kgf-m, 3.7 ft-lb)
T2: 6.7 N.m (0.68 kgf-m, 4.9 ft-lb)

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

Engine control module (ECM): 7.5 N.m (0.76 kgf-m, 5.5 ft-lb)

2. Fill engine coolant.
3. Charge refrigerant.