Heater Unit/Core Replacement

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

1. Make sure you have the anti-theft codes for the audio system.
2. Disconnect the negative cable from the battery. ',
3. Disconnect the suction and receiver lines 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. 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 1: Identifying Hose Clamps, Inlet Heater Hose And Outlet Heater Hose

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Remove the dashboard (see DASHBOARD/ STEERING HANGER BEAM REMOVAL/INSTALLATION ).
7. Disconnect the drain hose (A) with air conditioning. Remove the clips (B), the mounting bolts, the mounting nuts, and the blower-heater unit (C).
   Fig 2: Drain Hose, Clips And Blower-Heater Unit With Torque Specification

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Remove the blower unit from the heater unit.
9. Remove the self-tapping screws and the pipe cover (A). Remove the self-tapping screw and the pipe clamp (B), then carefully pull out the heater core (C) so you don't bend the inlet and outlet pipes.
   Fig 3: Identifying Pipe Cover, Pipe Clamp And Heater Core

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Remove the self-tapping screws and the pipe cover (D). Remove the bolts, the inlet and outlet pipes (E), and the expansion valve (F). If necessary, remove the self-tapping screws and the blower resistor (G). Remove the evaporator temperature sensor connector (H), then remove the self-tapping screws and the duct (I). Pull out the evaporator core (J) with the plate (K).
11. Install the heater core and the evaporator core in the reverse order of removal.
12. 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.
    • With air conditioning; be sure to connect the drain hose securely.
    • Adjust the air mix control cable (see AIR MIX CONTROL CABLE ADJUSTMENT ), the mode control cable (see MODE CONTROL CABLE ADJUSTMENT ), and the recirculation control cable (see RECIRCULATION CONTROL CABLE ADJUSTMENT ).
    • Enter the anti-theft codes for the audio system.
    • Set the clock.
    • 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.