Mitsubishi Lancer Evolution IX. Manual - part 559

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND EVAPORATOR UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-109

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND 

EVAPORATOR UNIT

REMOVAL AND INSTALLATION

M1552011600521

Pre-removal and Post-installation Operation
• Refrigerant draining and Refilling (Refer to Charging and 

Discharging 

P.55-104

).

• Engine coolant Draining and Refilling (Refer to GROUP 

14, On vehicles service 

P.14-15

).

• Instrument Panel Removal and Installation (Refer to 

GROUP 52A, Instrument Panel 

P.52A-2

).

• Air cleaner cover and air flow sensor assembly Removal 

and Installation (Refer to GROUP 15, Air cleaner 

P.15-5

).

• Rear console assembly Removal and Installation (Refer 

to GROUP 52A, Rear console assembly 

P.52A-8

).

• Front floor console assembly Removal and Installation 

(Refer to GROUP 52A, Front floor console assembly 

P.52A-7

).

• Front seat assembly Removal and Installation (Refer to 

GROUP 52A, Front seat assembly 

P.52A-18

).

AC304861

1

2

3

4

5

6

7

8

N

9

AC

12 ± 2 N·m

6, 7

O-ring

-Pipe coupling

A/C compressor oil:
SUN PAG 56

44 ± 10 N·m

44 ± 10 N·m

Removal steps 

1.

Front deck crossmember

2.

Centre duct

3.

Intake duct

•

Foot duct (RH), Rear heater duct A 
(RH) upper side (Refer to 

P.55-130

).

4.

Blower assembly

5.

Heater hose connection

<<

A

>>

6.

Flexible suction hose connection

<<

A

>>

7.

Liquid pipe B connection

8.

O-ring

9.

Heater unit

Removal steps (Continued)

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND EVAPORATOR UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-110

REMOVAL SERVICE POINT
<<A>> FLEXIBLE SUCTION HOSE/LIQUID 
PIPE B DISCONNECTION

CAUTION

As the compressor oil and receiver are highly 
moisture absorbent, use a non-porous material 
to plug the hose and nipples.
To prevent the entry of dust or other foreign bodies, 
plug the dismantled hose and the nipples of the 
expansion valves.

HEATER UNIT

DISASSEMBLY AND REASSEMBLY 
<LHD>

M1551005400503

AC504612

1

2

3

4

11

10

5

6

7

8

9

12

16

13

14

15

AB

6, 9

O-ring

-Pipe coupling

A/C compressor oil:
SUN PAG 56

N

Disassembly steps 

1.

Foot duct (LH)

2.

Air mixing damper control motor 
and potentiometer

3.

Mode selection damper control 
motor and potentiometer

4.

Heater core

5.

Expansion valve

6.

Joint

7.

O-ring

8.

Evaporator cover

9.

Evaporator

10. Air thermo sensor clip
11. Air thermo sensor
12. Heater water temperature sensor
13. Aspirator
14. Aspirator hose
15. Harness
16. Heater case

Disassembly steps (Continued)

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND EVAPORATOR UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-111

DISASSEMBLY AND REASSEMBLY 
<RHD>

M1551005400514

AC504713AB

6

O-ring

-Pipe coupling

A/C compressor oil:
SUN PAG 56

1

2

3

4

5

6

8

9

10

11

12

13

14

15

16

17

7

Disassembly steps 

1.

Foot duct (RH)

2.

Foot duct (LH)

3.

Evaporator cover

4.

Heater core

5.

Expansion valve

6.

Evaporator

7.

O-ring

8.

Air thermo sensor clip

9.

Air thermo sensor

10. Aspirator

11. Aspirator hose
12. Harness
13. Air mixing damper control motor 

and potentiometer

14. Mode selection damper control 

motor and potentiometer

15. Heater water temperature sensor 

clip

16. Heater water temperature sensor
17. Heater case

Disassembly steps (Continued)

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND EVAPORATOR UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-112

BLOWER ASSEMBLY

DISASSEMBLY AND REASSEMBLY

M1551005500287

AC504715

5

1

3

4

2

AB

Disassembly steps 

1.

Joint duct

2.

Outside/inside air selection damper 
control motor

3.

Blower motor

4.

Air filter

5.

Blower case

Disassembly steps (Continued)