Heater Unit/Core Replacement

SRS components are located in this area. Review the SRS COMPONENT LOCATION INDEX and PRECAUTIONS AND PROCEDURES before doing repairs or service.

1. Do the battery terminal disconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).
2. Models with air conditioning: Recover the A/C refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ), then disconnect the A/C lines from the evaporator core (see EVAPORATOR TEMPERATURE SENSOR TEST ).
3. When the engine is cool, drain the engine coolant from the radiator (see COOLANT CHECK ).
4. Remove the clip (A) from the inlet heater hose (B), and discard it. The clip is for factory assembly use only. Slide the hose clamps (C) back, then disconnect the inlet heater hose and the outlet heater hose (D) 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 Inlet Heater Hose, Hose Clamps, Heater Hose & Clip

   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: Heater Unit Mounting Nut With Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Remove the dashboard (see DASHBOARD/STEERING HANGER BEAM REMOVAL/INSTALLATION ).
7. Disconnect the connector (A) from the evaporator sensor, and remove the blower resistor wire harness (B).
   Fig 3: Identifying Blower Resistor Wire Harness & Connector

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
8. Remove the drain hose (A), then remove the mounting nuts and blower-heater unit (B).
   Fig 4: Drain Hose & Blower-Heater Unit With Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
9. Remove the self-tapping screws and the heater core cover (A).
   Fig 5: Identifying Heater Core Cover, Holder, Grommet & Heater Core

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. Remove the holder (B) and the grommet (C), then carefully pull out the heater core (D).
11. Install the heater 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.
    • Refill the cooling system with engine coolant (see COOLANT CHECK ).
    • If necessary, recharge the A/C system (see SYSTEM CHARGING ).
    • Make sure that there is no coolant leakage.
    • Make sure that there is no air leakage.
13. Do the battery terminal reconnection procedure (see BATTERY TERMINAL DISCONNECTION AND RECONNECTION ).