Honda Civic. Manual — part 769

Fig. 72: Measuring Resistance Between Evaporator Temperature Sensor
Terminals

3. Then pour warm water on the sensor, and check for a change in resistance.
4. Compare the resistance readings with the specifications shown in Fig. 73 ; the

resistance should be within the specifications.

Fig. 73: Resistance To Temperature Graph

5. If the resistance is not as specified, replace the evaporator temperature sensor

(see EVAPORATOR CORE REPLACEMENT ).

HVAC CONTROL UNIT REMOVAL AND INSTALLATION

1. Remove the center panel (see AUDIO UNIT

REMOVAL/INSTALLATION ).

2. Remove the dials (A), the self-tapping screws, and the HVAC control unit (B).

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

Fig. 74: Removing Dials, Self-Tapping Screws And HVAC Control Unit

3. Install the control unit in the reverse order of removal. After installation,

operate the various functions to make sure they work properly.

4. Run the self-diagnostic function to confirm that there are no problems in the

system (see GENERAL TROUBLESHOOTING INFORMATION ).

EVAPORATOR CORE REPLACEMENT

1. Recover the refrigerant with a recovery/recycling/charging station (see

REFRIGERANT RECOVERY ).

2. Remove the bolt.

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

Fig. 75: Removing Evaporator Core Bolt (With Specifications)

3. Remove the nut, then disconnect the A/C lines (A) from the evaporator core.

Fig. 76: Disconnecting A/C Lines From Evaporator Core (With
Specifications)

4. Remove the stud bolt.

Fig. 77: Removing Stud Bolt (With Specifications)

5. Remove the blower unit (see BLOWER UNIT REMOVAL AND

INSTALLATION ).

6. Disconnect the connectors (A) from the evaporator temperature sensor and the

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

power transistor, then remove the connector clip (B). Remove the self-tapping
screws, the expansion valve cover (C), and the seal (D).

Fig. 78: Disconnecting Connectors From Evaporator Temperature Sensor
And Power Transistor

7. Carefully pull out the evaporator core (A) without bending the lines, then

remove the plate (B).

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)