Mitsubishi Lancer (4A9 engine). Manual - part 305

HEATER UNIT AND BLOWER ASSEMBLY

HEATER, AIR CONDITIONER AND VENTILATION

55A-101

DISASSEMBLY AND REASSEMBLY

M1552020900702

ACA00925

1

AB

2

3

4

5

6

7

8

9

10

11

12

27

30

29

27

15

16

18

13

N

17

14

19

20

21

22

25

24

26

31

32

33

28

23

Disassembly steps 

1.

KOS-ECU

2.

Rear centre duct

3.

Front centre duct

4.

Foot duct

5.

Heater control unit <Vehicles 
without A/C> or A/C-ECU <Vehicles 
with A/C>

6.

Air mixing damper control motor

7.

Mode selection damper control 
motor

8.

Mode lever

9.

PTC heater <Diesel engine>

10. Outside/Inside air selection damper 

control motor 

11. Heater core cover
12. Heater core
13. Expansion valve
14. O-ring
15. Expansion valve cover
16. Upper case assembly
17. Evaporator
18. Fin thermo sensor
19. Air filter cover
20. Air filter
21. Power transistor
22. Blower motor
23. Air intake duct
24. Blower case upper

Disassembly steps (Continued)

HEATER HOSE <Diesel engine>

HEATER, AIR CONDITIONER AND VENTILATION

55A-102

INSPECTION

M1552014304101

FIN THERMO SENSOR CHECK

AC609399

25

20

15

10

5

0

AD

10

30

Resistance

(k )

Temperature ºC

  0

  40

-10

 20

Check that the resistance shown in the graph is 
almost satisfied when measuring the resistance 
between the terminals under two or more different 
temperature conditions.
NOTE: The temperature condition in checking 
should be within the range shown.

HEATER HOSE <Diesel engine>

REMOVAL AND INSTALLATION <DIESEL 
ENGINE>

M1551007700180

AC900342AB

49 ± 9 N·m

1

2

3

4

Heater hose removal steps 

1.

Heater water hose A

2.

Heater water hose B

3.

Heater water hose assembly

4.

Grommet

25. Outside/inside air selection damper
26. Blower case lower
27. Upper case
28. Mode selection damper (FOOT)
29. Mode selection damper (DEF)
30. Air mixing damper
31. Wiring harness
32. Aspirator
33. Lower case

Disassembly steps (Continued)

Heater hose removal steps 

MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR, OUTSIDE/INSIDE 

HEATER, AIR CONDITIONER AND VENTILATION

55A-103

MODE SELECTION DAMPER CONTROL MOTOR, AIR 

MIXING DAMPER CONTROL MOTOR, OUTSIDE/INSIDE AIR 

SELECTION DAMPER CONTROL MOTOR, POWER 

TRANSISTOR AND BLOWER MOTOR

REMOVAL AND INSTALLATION

M1554014900419

AC708788AB

1

2

3

4

5

6

7

8

Power transistor removal steps 

•

Bottom cover assembly 
(passenger's side) (Refer to 
GROUP 52A 

− Instrument Panel ).

1.

Power transistor
Blower motor removal steps 

•

Bottom cover assembly 
(passenger's side) (Refer to 
GROUP 52A 

− Instrument Panel ).

2.

Hose

3.

Blower motor

Air mixing damper control motor, 
mode selection damper control 
motor and outside/inside air 
selection damper control motor 
removal steps 

•

Foot duct (Refer to ).

•

A/C-ECU (Refer to ).

<<

A

>>

4.

Air mixing damper control motor

<<

A

>>

5.

Mode selection damper control 
motor

6.

Clean air filter cover

7.

Clean air filter

<<

A

>>

>>

A

<<

8.

Outside/inside air selection damper 
control motor

MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR, 

HEATER, AIR CONDITIONER AND VENTILATION

55A-104

REMOVAL SERVICE POINT

<<A>> AIR MIXING DAMPER CONTROL MOTOR, 
OUTSIDE/INSIDE AIR SELECTION DAMPER 
CONTROL MOTOR, MODE SELECTION DAMPER 
CONTROL MOTOR REMOVAL
NOTE: 

AC100628

A normal plate-type ratchet driver is recommended.

INSTALLATION SERVICE POINT

>>A<< OUTSIDE/INSIDE AIR SELECTION 
DAMPER CONTROL MOTOR INSTALLATION
Install the outside/inside air selection damper control 
motor while pressing the outside/inside air selection 
damper from the hole of the blower motor.

INSPECTION

M1552014304305

BLOWER MOTOR CHECK

AC611918

AH

<LHD>

AC711909AB

<RHD>

Check that the motor turns when applying battery 
power between the connector terminals. Also check 
to see that there is no abnormal sound emitted from 
the motor at this time.