Mitsubishi Lancer. Manual — part 264

AC200625

Cylinder block
drain plug

AC

ON-VEHICLE SERVICE

ENGINE COOLING

14-22

5. Apply the designated sealant to the screw area of

the cylinder block drain plug, and then tighten to
the standard torque.
Specified sealant: 3M Nut Locking Part

No.4171 or equivalent

Tightening torque:

40

± 5 N⋅ m <4G1>

44

± 5 N⋅ m <4G6>

6. Securely tighten the drain plug of the radiator.
7. Reinstall the radiator condenser tank.

CAUTION

Do not use alcohol or methanol anti-freeze or any
engine coolants mixed with alcohol or methanol
anti-freeze. The use of an improper anti-freeze
can cause corrosion of the aluminium compo-
nents.

AC303612AB

MB991871

AIR HOSE

8. By referring to the section on coolant, select an

appropriate concentration for safe operating
temperature within the range of 30 to 60%. Use
special tool LLC changer (MB991871) to refill the
coolant. A convenient mixture is a 50% water and
50% antifreeze solution (freezing point:

−31° C).

Recommended antifreeze: DIAQUEEN SUPER

LONG LIFE COOLANT or equivalent

Quantity:

5.0 L <4G1>
7.0 L <4G6>

NOTE: For how to use special tool MB991871,
refer to its manufacturer’s instructions.

9. Reinstall the radiator cap.
10.Start the engine and let it warm up until the

thermostat opens.

11.After repeatedly revving the engine up to 3,000

r/min several times, then stop the engine.

12.Remove the radiator cap after the engine has

become cold, and pour in coolant up to the brim.
Reinstall the cap.

CAUTION

Do not overfill the radiator condenser tank.
13.Add coolant to the radiator condenser tank

between the "F" and "L" mark if necessary.

CONCENTRATION MEASUREMENT

M1141001100352

Measure the temperature and specific gravity of the
engine coolant to check the antifreeze concentration.

Standard value: 30

− 60% (allowable concentra-

tion range)

Recommended antifreeze: DIAQUEEN SUPER

LONG LIFE COOLANT or equivalent

CAUTION

If the concentration of the anti-freeze is below
30%, the anti-corrosion property will be
adversely affected. In addition, if the concentra-
tion is above 60%, both the anti-freezing and
engine cooling properties will decrease, affecting
the engine adversely. For these reasons, be sure
to maintain the concentration level within the
specified range.

COOLING FAN MOTOR DRIVE CONTROL
UNIT CHECK

M1141006100250

1. Remove the cooling fan motor drive control unit

connector.

AC103195

Y1716AU

1

2

3

AC

Cooling fan motor
drive control unit

2. Turn the ignition switch to the "ON" position, and

measure the voltage between terminal 1 and 3 at
the harness side connector.

Standard value: system voltage

ON-VEHICLE SERVICE

ENGINE COOLING

14-23

3. Connect the cooling fan motor drive control unit

connector, and disconnect the cooling fan motor
(L.H.) connector.

4. Ensure that the A/C switch is off, and start the

engine and run it at idle.

AC303496AB

Cooling fan motor
drive control unit

5. Measure the voltage between the cooling fan

motor drive control unit side connector terminal 1
and 2.

Standard value: 1V or less

WARNING

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

6. Turn the A/C switch to the "ON" position.
7. Measure the voltage between the cooling fan

motor drive control unit side connector terminal 1
and 2 while the fan is running. The voltage should
repeat the values below.

Standard value:

1. 1 V or less
2. 8.2

± 0.7 V

3. System voltage

± 2.6 V

8. If the voltage does not repeatedly change as

indicated, replace the cooling fan motor drive
control unit. (Refer to

P.14-33

) <4G1> (Refer to

P.14-35

) <4G6>.

FAN CONTROL RELAY CONTINUITY CHECK

M1141006200280

AC211776

1

3

4

2

3

4

1

2

AC301712

Fan control relay

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

THERMOSTAT

ENGINE COOLING

14-24

COOLING FAN MOTOR CHECK

M1141007100220

1

2

AC303501AB

Cooling fan motor drive control unit

Cooling fan motor
(L.H.) connector

1

2

AC303502 AB

Cooling fan motor
drive control unit

Cooling fan motor
(R.H.) connector
<4G1 with A/C>

1. Remove the cooling fan motor connector.
2. Check to see that the cooling fan motor of the

radiator turns when applying battery power
between the connector terminal 1 and 2 of the
cooling fan motor. Also check to see that there is
no abnormal sound coming from the cooling fan
motor at this time.

3. If the cooling fan motor is defective, replace it.

(Refer to

P.14-33

) <4G1> (Refer to

P.14-35

)

<4G6>.

THERMOSTAT

REMOVAL AND INSTALLATION

M1141002400442

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Refilling (Refer to

P.14-21

).

• Air Cleaner Assembly Removal and Installation (Refer to

GROUP 15

P.15-3

).

• Battery Removal and Installation

AC203409AC

4

3

6

7

22 ± 4 N·m

<4G1>

AC301429

1

2

3

6

7

13 ± 2 N·m

AD

5

<4G6>

Removal steps

1.

Water temperature gauge unit
connector <4G6>

2.

Water temperature sensor unit
connector <4G6>

<<

A

>>

>

B

<<

3.

Radiator lower hose connection

4.

Engine control oxygen sensor
connector and connector bracket
<4G1>

5.

Control wiring harness clip <4G6>

6.

Cooling water inlet hose fitting

>>

A

<<

7.

Thermostat

THERMOSTAT

ENGINE COOLING

14-25

REMOVAL SERVICE POINT
<<A>> RADIATOR LOWER HOSE DIS-
CONNECTION

AC200641AC

Mating marks

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

INSTALLATION SERVICE POINTS
>>A<< THERMOSTAT INSTALLATION

CAUTION

Make absolutely sure that no oil adheres to the
rubber ring of the thermostat. Also do not fold or
scratch the rubber ring during installation.

AC000279

Jiggle valve

Rubber ring

AB

Install the thermostat so that the jiggle valve is facing
straight up. Be careful not to fold or scratch the rub-
ber ring.