Heater Unit/Core Replacement

SRS components are located in this area. Review the SRS component locations: '00-05 models (see COMPONENT LOCATION INDEX ), '06-09 models (see COMPONENT LOCATION INDEX ) and the precautions and procedures (see AIRBAG HANDLING AND STORAGE ) before doing repairs or service.

1. Do the battery terminal disconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
2. Remove the heat shield of the exhaust manifold (see step 22 on 2004-2009 MODELS ).
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.
   Fig 1: Identifying Cable Clamp, Heater Valve Cable And Heater Valve Arm

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. When the engine is cool, drain the engine coolant from the radiator (see COOLANT REPLACEMENT ).
5. Remove the mounting bolt from the heater valve. Slide the hose clamps (A) back, then disconnect the inlet heater hose (B) and the outlet heater hose (C) 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.
   Fig 2: Hose Clamps, Inlet Heater Hose And Outlet Heater Hose With Torque Specifications

   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 3: Identifying Mounting Nut

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
7. Remove the dashboard (see DASHBOARD REMOVAL/INSTALLATION ).
8. Remove the blower/evaporator unit (see BLOWER/EVAPORATOR UNIT REMOVAL/INSTALLATION ).
9. Remove the mounting bolts, the center brackets (A), and the audio bracket (B).
   Fig 4: Center Brackets And Audio Bracket With Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Remove the SRS unit (see SRS UNIT REPLACEMENT ).
11. Remove the self-tapping screws and the defroster outlet (A), then remove the wire harness clips (B).
    Fig 5: Identifying Defroster Outlet And Wire Harness Clips

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Disconnect the connectors (A) from the mode control motor and the air mix control motor, then remove the wire harness clip (B). Remove the mounting nuts, the mounting bolt, and the heater unit (C).
    Fig 6: Connectors, Wire Harness Clip And Heater Unit With Torque Specifications

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. Remove the self-tapping screws and the passenger's heater outlet (A), then remove the self-tapping screw and the clamp (B). Pull out the heater core (C), taking care not to bend the inlet and outlet pipes.
    Fig 7: Identifying Passenger'S Heater Outlet, Clamp 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 REPLACEMENT ).
    • Adjust the heater valve cable (see HEATER VALVE CABLE ADJUSTMENT ).
    • Make sure that there is no engine coolant leakage.
    • Make sure that there is no air leakage.
    • For evaporator and A/C-related information, refer to blower/evaporator unit removal and installation (see BLOWER/EVAPORATOR UNIT REMOVAL/INSTALLATION ).
16. Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).