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 BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
2. Disconnect the suction and the receiver lines from the evaporator core (see step 2 on BLOWER UNIT COMPONENT 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, 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 1: Identifying Hose Clamps, Inlet Heater Hose And Outlet Heater Hose

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

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Remove the dashboard (see DASHBOARD/STEERING HANGER BEAM REMOVAL/INSTALLATION ).
7. Disconnect the connectors (A) from the blower motor and the power transistor, then remove the wire harness clips (B).
   Fig 3: Identifying Wire Harness Clips And Connectors

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Disconnect the connectors (A) from the mode control motor and the recirculation control motor, then remove the wire harness clips (B).
   Fig 4: Identifying Wire Harness Clips And Connectors

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

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Remove the mounting nuts and the blower-heater unit (A).
    Fig 6: Mounting Nuts And Blower-Heater Unit With Torque Specifications

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
11. Remove the self-tapping screws, the joint duct (A), and seal (B). Remove the self-tapping screws, then remove the passenger's heater outlet (C), and the heater core cover (D). Remove the self-tapping screws, the heater pipe brackets (E), the grommets (F), and carefully pull out the heater core (G) so you don't bend the inlet and outlet pipes.
    Fig 7: Identifying Joint Duct, Heater Pipe Brackets And Seal

    Courtesy of AMERICAN HONDA MOTOR CO., INC.
12. Install the heater core in the reverse order of removal.
13. 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 ).
    • Make sure that there is no coolant leakage.
    • Make sure that there is no air leakage.
    • Refer to evaporator core replacement (see BLOWER UNIT COMPONENT REPLACEMENT ).
14. Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).