Heater Core Case: Service and Repair

HEATER AND COOLING UNIT

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 connector and bolts, and remove the high-pressure hose and AC pipe from the expansion valve.
5. Loosen the heater hose clamps and remove the hoses.






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






8. Remove the heater and cooling unit.
1. Remove the bolt and remove the heater and cooling unit.






9. Remove the blower motor unit assembly.
1. Release the claws and remove the bolts.






2. Remove the blower motor unit assembly as shown in the figure.






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)