Heater Core Case: Service and Repair

Heater Unit/Core Replacement

SRS components are located in this area. Review the SRS component locations Locations and the precautions and procedures Service and Repair before doing repairs or service.

1. Do the battery terminal disconnection procedure Procedures.

2. Recover the refrigerant with a recovery/recycling/ charging station A/C Refrigerant Recovery

3. Disconnect the A/C line from the evaporator core Service and Repair.

4. When the engine is cool, drain the engine coolant from the radiator Service and Repair.

5. From under the hood, slide the hose clamps (A) back. Disconnect the inlet heater hose (B) and the outlet heater hose (C) from the heater unit. Note the layout of the hose.

Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on the electrical parts or the painted surfaces. If any coolant spills, rinse it off immediately.






6. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines or the brake lines.





7. Remove the dashboard Dashboard/Steering Hanger Beam Removal/Installation.

8. Disconnect the connector (A) from the blower motor. Remove the wire harness clip (B).






9. Disconnect these connector (A) from the recirculation control motor.






10. Disconnect these connectors (A) from the mode control motor, the evaporator temperature sensor, and the power transistor. Remove the wire harness clips (B).






11. Disconnect the connectors (A) from the air mix control motor and A/C wire harness. Remove the connector clip (B), the wire harness clips (C), and the wire harness (D).






12. Remove the clip (A) and the duct (B). Side the clamp, then remove the drain hose (C). Remove the mounting bolt, mounting nuts, and blower-heater unit (D).






13. Remove the self-tapping screws and the driver's duct (A). Remove the self-tapping screws, the heater core cover (B), the grommet (C), and carefully pull out the heater core (D).





14. Install the heater core and the evaporator core in the reverse order of removal.

15. Install the heater unit in the reverse order of removal, and note these items:

- Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely.
- Refill the cooling system with engine coolant Service and Repair.
- Make sure that there is no coolant leakage.
- Make sure that there is no air leakage.
- Charge the system A/C System Charging.

16. Do the battery terminal reconnection procedure Procedures.