Heater Unit/Core Replacement

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ) and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or service.

1. Do the battery terminal disconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
2. Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY  ).
3. Disconnect the A/C line from the evaporator core (see EVAPORATOR CORE REPLACEMENT  ).
4. When the engine is cool, drain the engine coolant from the radiator (see COOLANT CHECK ).
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 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.

   Fig 1: Identifying Hose Clamps, Inlet And Outlet Heater Hose

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines or the brake lines.
   Fig 2: Removing Mounting Nut From Heater Unit With Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
7. Remove the dashboard (see DASHBOARD REPLACEMENT ).
8. Disconnect the left engine compartment wire harness connectors (A). Remove the ducts (B), and the drain hose (C). Then remove the mounting nuts, and the blower-heater unit (D).
   Fig 3: Harness Connectors, Ducts, Drain Hose And Blower-Heater Unit With Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Disconnect the connector (A) from the blower motor. Detach the harness clips (B).
   Fig 4: Identifying Connector And Clips

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Disconnect these connectors (A): The passenger's mode control motor, the power transistor, and the passenger's air mix control motor. Detach the harness clips (B).
    Fig 5: Identifying Connectors And Harness Clips

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Disconnect these connectors (A): The recirculation control motor, and the climate control unit. Detach the harness clip (B).
    Fig 6: Identifying Connectors And Harness Clips

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Disconnect these connectors (A): the driver's air mix control motor, the driver's mode control motor, and evaporator temperature sensor. Detach the harness clips (B), and remove the wire harness (C).
    Fig 7: Identifying Connectors, Wire Harness And Harness Clip

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. Remove the self-tapping screws and the passenger's heater duct (A). Remove the self-tapping screws and the joint duct (B). Remove the self-tapping screw and the heater core cover (C). Remove the self-tapping screw, the heater pipe bracket (D), and the grommet (E), and carefully pull out the heater core (F).
    Fig 8: Identifying Joint Duct, Passenger's Heater Duct, Heater Core Cover, Grommet And Heater Core

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
14. Install the heater 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 (see COOLANT CHECK ).
    • Make sure that there is no coolant leakage.
    • Make sure that there is no air leakage.
    • Charge the system (see SYSTEM CHARGING  ).
16. Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).