Heater Unit/Core Replacement

SRS components are located in this area Review the SRS component locations (see COMPONENT LOCATIONS ) 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. Recover the refrigerant with a recovery/recycling/charging station (see RECEIVER/DRYER DESICCANT REPLACEMENT )
3. Disconnect the A/C line from the evaporator core (see EVAPORATOR CORE REPLACEMENT )
4. When the engine is cool, drain the engine coolant from the radiator (see COOLANT REPLACEMENT )
5. 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 orientation of the hoses

   Engine coolant will run out when the hoses are disconnected, dram 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 Heater Hose And Outlet Heater Hose

   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 2: Heater Unit And Mounting Nut With Torque Specification

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
7. Remove the dashboard (see DASHBOARD REPLACEMENT )
8. Disconnect the left engine compartment wire harness connectors (C301 and 302) (A) Remove the ducts (B), and the drain hose (C) Then remove the mounting nuts, and the blower-heater unit (D)
   Fig 3: Left Engine Compartment Wire Harness Connectors, Blower-Heater Unit And Mounting Nuts With Torque Specification

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Disconnect the connector (A) from the blower motor Remove the wire harness clips (B)
   Fig 4: Identifying Blower Motor Wire Harness Clips And Connector

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Disconnect these connectors (A) The passenger's mode control motor, the power transistor, and the passenger's air mix control motor Detach the harness clips (B)
    Fig 5: Identifying Passenger's Air Mix Control Motor Connectors And Harness Clips

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Disconnect these connectors (A) The recirculation control motor, and the climate control unit Detach the harness clip (B)
    Fig 6: Identifying Recirculation Control Motor Connectors And Harness Clip

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Disconnect these connectors (A) the driver's air mix control motor, the driver's mode control motor, and evaporator temperature sensor Detach the harness clips (B) and the wire harness (C)
    Fig 7: Identifying Driver's Air Mix Control Motor And Connectors

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
13. Remove the self-tapping screws and the passenger's heater duct (A) Remove the self-tapping screws and the joint duct (B) Remove the self-tapping screw and the heater core cover (C) Remove the self-tapping screw, the heater pipe bracket (D), and the grommet (E), and carefully pull out the heater core (F)
    Fig 8: Identifying Passenger's Heater Duct Self-Tapping Screws And Heater Core Cover

    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 )
    • Make sure that there is no coolant leakage
    • Make sure that there is no air leakage
    • Charge the system (see SYSTEM CHARGING )
16. Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION )