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. Disconnect the suction and receiver lines from the front evaporator core Service and Repair.

3. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C). Turn the heater valve arm to the fully opened position as shown.





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

5. Slide the hose clamps (A) back. Remove the nut and the water valve (B), then disconnect the inlet heater hose (C) and the outlet heater hose (D) from the heater unit. 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 and the brake lines, etc.





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

8. Disconnect the connectors (A) from the front blower motor and the front power transistor, then remove the wire harness clips (B).






9. Disconnect the connectors (A) from the front mode control motor and the recirculation control motor, then remove the wire harness clips (B) and the connector clip (C).






10. Disconnect the connectors (A) from the evaporator sensor and the front air mix control motor, then remove the wire harness clips (B) and the wire harness (C).






11. Remove the drain hose (A), then remove the nuts and the blower-heater unit (B).






12. Remove the self-tapping screws, the joint duct (A), and seal (B). Remove the self-tapping screws, then remove the passenger's heater outlet (C), and the heater core cover (D). Remove the self-tapping screws, the heater pipe brackets (E), the grommets (F), and carefully pull out the heater core (G) so you don't bend the inlet and outlet pipes.





13. Install the heater core in the reverse order of removal.

14. 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.
- Adjust the heater valve cable Adjustments.
- Make sure that there is no coolant leakage.
- Make sure that there is no air leakage.
- Refer to front evaporator core replacement Service and Repair.

15. Do the battery terminal reconnection procedure Procedures.