Mitsubishi Lancer Evolution IX. Manual - part 658

AC210667

Cooling fan motor 
connector: 
Harness side

MB991222

Circuit tester

Fan controller

AB

ON-VEHICLE SERVICE

ENGINE COOLING

14-17

5. Insert special tool probe (MB991222) at the back 

of the cooling fan motor connector.

6. Connect the special tool to the circuit tester.
7. Ensure that the A/C switch is off, and start the 

engine and run it at idle.

8. Measure the voltage between the cooling fan 

motor connector terminals.

Standard value: 1V or less

9. Turn the A/C switch to the "ON" position.

WARNING

 Stay clear of the fan when the fan starts run-
ning.

10. Measure the voltage between the cooling fan 

motor connector terminals while the fan is 
running. The voltage should repeat the values 1) 
and 2) below.

Standard value:

1) 8.2 

± 2.6 V

2) Battery positive voltage 

± 2.6 V

11.If the voltage does not repeatedly change as 

indicated, replace the fan controller.

12.Install the centre under cover (Refer to GROUP 

51, Front Bumper 

P.51-2

).

FAN CONTROL RELAY CONTINUITY 
CHECK

M1141006200354

1

3

4

2

3

4

1

2

AC210672

Battery

AB

Battery 
voltage

Terminal No.to 
be connected to 
tester

Continuity test 
results

Not applied 4 

− 2

Open circuit

• Connect 

terminal 
No.1 and 
battery 
(+) 
terminal.

• Connect 

terminal 
No.3 and 
battery 
(

−) 

terminal.

4 

− 2

Less than 2 ohms

COOLING FAN MOTOR CHECK

M1141007100134

1. Remove the centre under cover (Refer to GROUP 

51, Front Bumper 

P.51-2

).

AC210668

Cooling fan
motor
connector: 
Component side

Cooling fan motor

AB

THERMOSTAT

ENGINE COOLING

14-18

2. Remove the cooling fan motor connector.

WARNING

 Stay clear of the fan when the fan starts run-
ning.

3. Check to see that the fan motor of the radiator 

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

4. If the cooling fan motor is defective, replace it.
5. Install the centre under cover (Refer to GROUP 

51, Front Bumper 

P.51-2

).

THERMOSTAT

REMOVAL AND INSTALLATION

M1141002400884

Pre-removal Operation
• Under Cover Removal (Refer to GROUP 51, Front 

Bumper 

P.51-2

).

• Engine Coolant Draining (Refer to 

P.14-15

).

• Intake Air Duct Removal (Refer to GROUP 15, Air 

Cleaner 

P.15-5

).

• Air Hose E, Air Pipe C and Air Hose D Removal (Refer to 

GROUP 15, Intercooler 

P.15-6

).

Post-installation Operation
• Air Hose E, Air Pipe C and Air Hose D Installation (Refer 

to GROUP 15, Intercooler 

P.15-6

).

• Intake Air Duct Installation (Refer to GROUP 15, Air 

Cleaner 

P.15-5

).

• Engine Coolant Refilling (Refer to 

P.14-15

).

• Under Cover Installation (Refer to GROUP 51, Front 

Bumper 

P.51-2

).

AC504958

1

8

7

4

3

2

AB

11 ± 1 N·m

5.0 ± 1.0 N·m

10 ± 1 N·m

5

6

11 ± 1 N·m

Removal steps 

1.

Accelerator cable connection <LH 
drive vehicles>

2.

Control wiring harness connection

3.

Vacuum hose and pipe assembly

<<

A

>> >>

B

<< 4.

Radiator upper hose connection

5.

Wiring harness clamp

Removal steps (Continued)

THERMOSTAT

ENGINE COOLING

14-19

REMOVAL SERVICE POINT
<<A>> RADIATOR UPPER HOSE DISCON-
NECTION

AC200641AB

Mating marks

Make mating marks on the radiator hose and the 
hose clamp. Disconnect the radiator hose.

INSTALLATION SERVICE POINTS
>>A<< THERMOSTAT INSTALLATION

CAUTION

Make absolutely sure that no oil is adhering to 
the rubber ring of the thermostat. In addition, be 
careful not to fold over or scratch the rubber ring 
when inserting. If the rubber ring is damaged, 
replace the thermostat.
Install the thermostat being careful not to fold over or 
scratch the rubber ring.

>>B<< RADIATOR UPPER HOSE 
CONNECTION

AC200642

Mating marks

Projection

Water outlet fitting

AB

1. Insert each hose as far as the projection of the 

water outlet fitting.

2. Align the mating marks on the radiator hose and 

hose clamp, and then connect the radiator hose.

INSPECTION

M1141002500494

THERMOSTAT CHECK

ACX00400

1. Immerse the thermostat in water, and heat the 

water while stirring. Check the thermostat valve 
opening temperature.

Standard value:

Valve opening temperature: 80 

± 1.5°C

ACX00401AB

Valve lift

2. Check that the amount of valve lift is at the 

standard value when the water is at the 
full-opening temperature.
NOTE: Measure the valve height when the ther-
mostat is fully closed, and use this measurement 
to compare the valve height when the thermostat 
is fully open.

Standard value:

Full-opening temperature: 93

°C

Amount of valve lift: 9.5 mm or more

6.

Harness bracket

7.

Water outlet fitting

>>

A

<< 8.

Thermostat

Removal steps (Continued)

WATER PUMP

ENGINE COOLING

14-20

WATER PUMP

REMOVAL AND INSTALLATION

M1141002701004

CAUTION

If the vehicle is equipped with the Brembo

™ disc brake, during maintenance, take care not to contact 

the caliper with tools or parts, because the caliper paint will be scratched.

Pre-removal Operation
• Under Cover Removal (Refer to GROUP 51, Front 

Bumper 

P.51-2

).

• Engine Coolant Draining (Refer to 

P.14-15

).

• Timing Belt Tensioner Adjuster Removal (Refer to 

GROUP 11A, Timing Belt 

P.11A-36

).

Post-installation Operation
• Timing Tensioner Adjuster Belt Installation (Refer to 

GROUP 11A, Timing Belt 

P.11A-36

).

• Engine Coolant Refilling (Refer to 

P.14-15

).

• Under Cover Installation (Refer to GROUP 51, Front 

Bumper 

P.51-2

).

AC406755
AC504976AB

N

22 ± 4 N·m

2

1

4

3

14 ± 1 N·m

24 ± 4 N·m

23 ± 3 N·m

N

20 ± 2 N·m

8 × 60

8 × 22

8 × 14

8 × 22

8 × 55

Bolt specifications

2

Nominal diameter  × Nominal  length mm

Removal steps  

1.

Alternator brace

2.

Water pump

3.

Water pump gasket

>>

A

<< 4.

O-ring

Removal steps  (Continued)