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 12 volt 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. Drain the engine coolant from the radiator Service and Repair.

5. From the inlet heater hose, remove the clip (A). Slide the hose clamps (B) back, then disconnect the inlet heater hose (C) and the outlet heater hose (D) from the heater unit. Note the layout of the hoses. 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.

NOTE: Discard the removed clip (A) because it is unnecessary at the time of heater hose installation.






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





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

8. Disconnect these connectors (A) from the blower motor and the recirculation control motor. Remove the wire harness clips (B).






9. Disconnect the connector (A) from the evaporator temperature sensor. Disconnect these connectors (B) from the mode control motor, the power transistor and the air mix control motor, then remove the A/C wire harness.






10. Remove the drain hose (A). Remove the mounting nuts and the blower-heater unit (B).






11. Remove the self-tapping screws and the heater core cover (A), the cap (B), and the grommet (C), then carefully pull out the heater core (D).





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

13. 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.
- Refer to the evaporator core replacement Service and Repair.

14. Do the 12 volt battery terminal reconnection procedure Procedures.