Honda Civic. Manual — part 743

BLOWER UNIT COMPONENT REPLACEMENT

Note these items when overhauling the blower unit:

The recirculation control motor (A), blower motor (B) and the dust and pollen
filter (C) can be replaced without removing the blower unit.

Before reassembly, make sure that the recirculation control linkage and door
move smoothly without binding.

After reassembly, make sure the recirculation control motor runs smoothly (see
RECIRCULATION CONTROL MOTOR TEST ).

Fig. 48: Identifying Recirculation Control Motor, Blower Motor And Dust
And Pollen Filter
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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 ) in the SRS before doing repairs or
service.

1. Make sure you have the anti-theft code for the audio or navigation system, then

write down the audio presets.

2. Make sure the ignition is OFF, then disconnect the negative cable from the

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)

battery.

3. Remove the air cleaner housing assembly (see THROTTLE BODY

CLEANING ).

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; 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. 49: Identifying Hose Clamps, 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 brake lines, etc.

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)

Fig. 50: Identifying Heater Unit Mounting Nut (With Torque
Specifications)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Remove the dashboard (see SIDE DEFOGGER VENT TRIM

REMOVAL/INSTALLATION ).

8. Disconnect the connector (A) from the blower motor. Remove the wire harness

clip (B).

Fig. 51: Identifying Blower Motor Connector And Wire Harness Clip
Courtesy of AMERICAN HONDA MOTOR CO., INC.

9. Disconnect the connector (A) from the recirculation control motor.

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)

Fig. 52: Identifying Recirculation Control Motor Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

10. Disconnect the connectors (A) from the mode control motor, the evaporator

temperature sensor, and the power transistor. Remove the wire harness clip(B).

Fig. 53: Identifying Connectors And Wire Harness Clip
Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Disconnect the connectors (A) from the air mix control motor and A/C wire

harness. Remove the connector clip (B), the wire harness clips (C), and the
wire harness (D).

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)