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 USING THE GR8 BATTERY DIAGNOSTIC STATION ).
2. Disconnect the front receiver line and front suction line from the front evaporator core (see FRONT EVAPORATOR CORE REPLACEMENT  ).
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: Identifying Inlet And Outlet Heater Hose With Hose Clamps

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Remove the mounting nuts from the heater unit. Take care not to damage or bend the fuel lines or the brake lines, etc.
   Fig 2: Mounting Nuts Of Heater Unit With Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Remove the dashboard/steering hanger beam (see DASHBOARD/STEERING HANGER BEAM REMOVAL/INSTALLATION ).
7. Disconnect the connector (A) from the front blower motor. Remove the wire harness clips (B).
   Fig 3: Identifying Wire Harness Clips And Connector Of Blower Motor

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Disconnect the connectors (A) from the front mode control motor, the passenger's air mix control motor (with climate control), the recirculation control motor, and the front power transistor. Remove the wire harness clips (B).
   Fig 4: Identifying Wire Harness Clips And Connectors Of Front Mode Control Motor

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Disconnect the connectors (A) from the air mix control motor and the front evaporator temperature sensor. Remove the wire harness clips (B) and the wire harness (C).
   Fig 5: Identifying Connectors, Wire Harness Clips And Wire Harness

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Turn over the carpet. Remove the clip (A) and remove the rear heater duct (B).
    Fig 6: Removing Clip And Rear Heater Duct

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Remove the mounting nuts and bolts. Slide the blower-heater unit (A) back, then remove the drain hose (B) and the blower-heater unit.
    Fig 7: Blower-Heater Unit And Drain Hose With Torque Specifications

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Remove the self-tapping screws and the passenger's heater duct (A). Remove the self-tapping screws and the expansion valve cover (B). Remove the self-tapping screw and the front heater core cover (C). Remove the self-tapping screws, the heater pipe brackets (D), the grommets (E), and carefully pull out the front heater core (F).
    Fig 8: Identifying Passenger's Heater Duct, Expansion Valve Cover, Heater Core Cover, Heater Pipe Brackets, Heater Core 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.
    • Refer to the FRONT EVAPORATOR CORE REPLACEMENT  .
      NOTE: Part of battery terminal reconnection procedure.
15. Do the battery terminal reconnection procedure (see USING THE GR8 BATTERY DIAGNOSTIC STATION ).