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. Disconnect the A/C lines from the front evaporator core (see step  3 ).
3. When the engine is cool, drain the engine coolant from the radiator (see COOLANT CHECK ).
4. 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.

   Fig 1: Inlet Heater Hose, Outlet Heater Hose, Hose Clamps And Mounting Nuts Torque Specification

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Remove the mounting nut (D) from the heater unit. Take care not to damage or bend the fuel lines or the brake lines.
6. Remove the dashboard (see DASHBOARD/STEERING HANGER BEAM REMOVAL/INSTALLATION ).
7. Disconnect the connectors (A) from the front blower motor. Detach the wire harness clips (B) and the connector clip (C).
   Fig 2: Identifying Front Blower Motor Connector, Harness Clips And Connector Clips

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Disconnect the connector (A) from the recirculation control motor. Remove the mounting nuts. Slide the blower-heater unit (B) back, then remove the drain hose (C) and the blower-heater unit.
   Fig 3: Recirculation Control Motor Connector, Blower-Heater Unit And Drain Hose With Mounting Nuts Torque Specification

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Remove the blower unit (see BLOWER UNIT REMOVAL/INSTALLATION  ).
10. Disconnect the connectors (A) from the cool box control motor (with climate control), the passenger's air mix control motor (with climate control), and the front power transistor. Detach the wire harness clips (B) and the connector clip (C).
    Fig 4: Identifying Cool Box Control Motor Connector, Wire Harness Clips And Connector Clip

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Disconnect the connectors (A) from the front mode control motor, the air mix control motor, and the evaporator temperature sensor. Detach the wire harness clips (B) and remove the wire harness (C).
    Fig 5: Identifying Front Mode Control Motor Connector, Wire Harness Clips And Connector Clip

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Remove the self-tapping screws and the passenger's heater duct and cover (A). Remove the self-tapping screws, the expansion valve cover (B), and the seal (C). Remove the self-tapping screws, the heater pipe brackets (D), and the grommets (E). Carefully pull out the front heater core (F).
    Fig 6: Identifying Passenger's Heater Duct And Cover, Expansion Valve Cover, Seal, Heater Pipe Brackets And Grommets

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. Install the front heater core, and the front evaporator 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 the outlet heater hoses.
    • Install the inlet and the outlet 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.
    • Make sure that there is no air refrigerant leakage.
    • Refer to the FRONT EVAPORATOR CORE REPLACEMENT  .
      NOTE: Part of battery terminal reconnection procedure.
15. Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).