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 performing repairs or service.

1. Turn the ignition switch ON (II).
2. Turn the mode control dial to the floor vent position.

   This will prevent the mode control doors from being damaged when the dashboard is removed.

3. Turn the ignition switch OFF.
4. Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
5. Disconnect the negative cable from the battery.
6. Disconnect the suction and receiver lines from the evaporator core (see EVAPORATOR CORE REPLACEMENT  ).
7. 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: Disconnecting Heater Valve Cable From Heater Valve Arm

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. When the engine is cool, drain the engine coolant from the radiator (see COOLANT CHECK ).
9. Slide the hose clamps (A) back, then disconnect the inlet heater hose (B) and the outlet heater hose (C) from the heater core. 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: Disconnecting Inlet Heater Hose And Outlet Heater Hose From Heater Core

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Remove the mounting bolt and the heater valve as shown.
    Fig 3: Removing Mounting Bolt And Heater Valve

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines and the brake lines, etc.
    Fig 4: Removing Mounting Nut From Heater Unit

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Remove the dashboard (see DASHBOARD/STEERING HANGER BEAM REMOVAL/INSTAL ).
13. Remove the blower unit (see BLOWER UNIT REMOVAL AND INSTALLATION  ).
14. Disconnect the drain hose (A), then remove the wire harness (B), the mounting bolts and the heater unit (C).
    Fig 5: Disconnecting Drain Hose, Then Wire Harness

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
15. Remove the self-tapping screws and the expansion valve cover (A). Carefully pull out the evaporator core (B) so you don't bend the inlet and outlet pipes. Remove the grommet (C), then remove the self-tapping screws and the flange cover (D). Remove the self-tapping screws and the pipe cover (E), then carefully pull out the heater core (F) so you don't bend the inlet and outlet pipes.
    Fig 6: Removing Self-Tapping Screws And Expansion Valve Cover

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
16. Install the heater core and the evaporator core in the reverse order of removal.
17. 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 ).
    • Be sure to connect the drain hose securely.
    • Adjust the heater valve cable (see HEATER VALVE CABLE ADJUSTMENT  ).
    • Make sure that there is no coolant leakage.
    • Make sure that there is no air leakage.
    • Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
    • Do the power window control unit reset procedure (see RESETTING THE POWER WINDOW CONTROL UNIT ).
    • Enter the anti-theft code for the radio, then enter the customer's radio station presets.
    • Refer to evaporator core replacement (see step  6 .).