Mitsubishi Colt Ralliart. Manual — part 105

GENERAL INFORMATION

ENGINE COOLING

14-2

GENERAL INFORMATION

M1141000100906

The cooling system is designed to keep every part of
the engine at appropriate temperature in whatever
condition the engine may be operated. The cooling
method is of the water-cooled, pressure forced circu-
lation type in which the water pump pressurizes cool-
ant and circulates it throughout the engine. If the
coolant temperature exceeds the prescribed temper-

ature, the thermostat opens to circulate the coolant
through the radiator as well so that the heat
absorbed by the coolant may be radiated into the air.
The water pump is of the centrifugal impeller type
and is driven by the drive belt from the crankshaft.
The radiator is the corrugated fin, cross flow type.

Item

4A9

4G1

Radiator

Performance kJ/h

155,200

175,300

SERVICE SPECIFICATIONS

M1141000300609

Item

Standard value

Limit

Valve opening pressure of radiator cap kPa

74

− 103

Minimum 64

Range of coolant antifreeze concentration of radiator %

30

− 60

−

Thermostat

Valve opening temperature of
thermostat

°C

4A9

82

± 2

−

4G1

82

± 1.5

−

Full-opening temperature of thermostat

°C

95

−

Valve lift mm

4A9

8 or more

−

4G1

8.5 or more

−

LUBRICANTS

M1141000400736

Item

Specified coolant

Quantity L

Engine coolant (including
radiator condense tank)

4A9-M/T

DIA QUEEN SUPER LONG LIFE
COOLANT or equivalent

5.3

4A9-CVT

5.4

4G1

6.8

SEALANTS <4G1>

M1141000500562

Item

Specified sealant

Cylinder block drain plug

3M Nut Locking Part No.4171 or equivalent

Engine coolant temperature sensor

Main

Index

Group

TOC

SPECIAL TOOL

ENGINE COOLING

14-3

SPECIAL TOOL

M1141000600644

Tool

Number

Name

Use

MB991870AB

MB991871

LLC changer

Coolant refilling

ON-VEHICLE SERVICE

ENGINE COOLANT LEAK CHECK

M1141001000504

WARNING

When pressure testing the cooling system,
slowly release cooling system pressure to
avoid getting burned by hot coolant.

CAUTION

• Be sure to completely clean away any mois-

ture from the places checked.

• When the tester is taken out, be careful not to

spill any coolant.

•

ACX01844

Cap adapter

Adapter

AC

Be careful when installing and removing the
tester and when testing not to deform the
filler neck of the radiator.

1. Check that the coolant level is up to the filler neck.

Install a radiator tester and apply 160 kPa
pressure, and then check for leakage from the
radiator hose or connections.

2. If there is leakage, repair or replace the

appropriate part.

RADIATOR CAP VALVE OPENING
PRESSURE CHECK

M1141001300624

NOTE: Be sure that the cap is clean before test-
ing. Rust or other foreign material on the cap seal
will cause an improper reading.

AC211643 AB

Cap adapter

1. Use a cap adapter to attach the cap to the tester.
2. Increase the pressure until the indicator of the

gauge stops moving.
Minimum limit: 64 kPa
Standard value: 74

− 103 kPa

3. Replace the radiator cap if the reading does not

remain at or above the limit.

Main

Index

Group

TOC

ON-VEHICLE SERVICE

ENGINE COOLING

14-4

ENGINE COOLANT REPLACEMENT
<4A9>

M1141001200984

NOT USING SPECIAL TOOL LLC
CHANGER (MB991871)<CVT>

WARNING

When removing the radiator cap, use care to
avoid contact with hot coolant or steam.
Place a shop towel over the cap and turn the
cap anti-clockwise a little to let the pressure
escape through the vinyl tube. After relieving
the steam pressure, remove the cap by
slowly turning it anti-clockwise.

1. Drain the water from the radiator, heater core and

engine after unplugging the radiator drain plug
and removing the radiator cap.

AC402918AB

Cylinder block
drain plug

Drive shaft
assembly (RH)

2. Drain the water in the water jacket by unplugging

the drain plug of the cylinder block.

3. Remove the radiator condenser tank and drain

the coolant.

4. Drain the coolant then clean the path of the

coolant by injecting water into the radiator from
the radiator cap area.

AC403641AB

Cylinder block
drain plug

Gasket

5. Replace the gasket, and tighten the cylinder block

drain plug to the specified torque.

Tightening torque: 27

± 3 N⋅m

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

AC403211

AB

Breather plug

Thermo valve

Air intake duct

8. Remove the thermo valve breather plug.

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

appropriate concentration for safe operating
temperature within the range of 30 to 60%. Refill
engine coolant gradually through the radiator cap.
A convenient mixture is a 50% water and 50%
antifreeze solution (freezing point:

−31°C).

Recommended antifreeze: DIA QUEEN SUPER

LONG LIFE COOLANT or equivalent

Quantity: 5.4 L

AC403561AB

Breather
plug

O-ring

10.When no more air bubbles appear from the

thermo valve breather plug, replace the breather
plug and O-ring. Then tighten the breather plug to
the specified torque.

Tightening torque: 1.5

± 0.3 N⋅m

11.Refill the engine coolant up to the top of the

radiator port.

12.Tighten the radiator cap securely.
13.Remove the radiator condenser tank cap, and

add the engine coolant up to the "F" line of the
level gauge.

14.Turn the A/C switch to OFF position to start the

engine and warm up until the cooling fan
operates.

Main

Index

Group

TOC

ON-VEHICLE SERVICE

ENGINE COOLING

14-5

NOTE: This work is to open the thermostat fully.

15.Rev the engine several times and then stop it.

Check that there are no coolant leaks.

16.Remove the radiator cap with the engine cool,

and then refill the engine coolant up to the top of
the radiator port.

17.Tighten the radiator cap securely.

CAUTION

Do not overfill the radiator condenser tank.
18.Remove the radiator condenser tank cap, and

add the engine coolant up to the "F" line of the
level gauge.

USING SPECIAL TOOL LLC CHANGER
(MB991871)

WARNING

When removing the radiator cap, use care to
avoid contact with hot coolant or steam.
Place a shop towel over the cap and turn the
cap anti-clockwise a little to let the pressure
escape through the vinyl tube. After relieving
the steam pressure, remove the cap by
slowly turning it anti-clockwise.

1. Drain the water from the radiator, heater core and

engine after unplugging the radiator drain plug
and removing the radiator cap.

AC402918AB

Cylinder block
drain plug

Drive shaft
assembly (RH)

2. Drain the water in the water jacket by unplugging

the drain plug of the cylinder block.

3. Remove the radiator condenser tank and drain

the coolant.

4. Drain the coolant then clean the path of the

coolant by injecting water into the radiator from
the radiator cap area.

AC403641AB

Cylinder block
drain plug

Gasket

5. Replace the gasket, and tighten the cylinder block

drain plug to the specified torque.

Tightening torque: 27

± 3 N⋅m

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.

AC402238

MB991871

AB

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
the special tool LLC changer (MB991871) to refill
the engine coolant up to the top of the radiator
port. A convenient mixture is a 50% water and
50% antifreeze solution (freezing point:

−31°C).

Recommended antifreeze: DIA QUEEN SUPER

LONG LIFE COOLANT or equivalent

Quantity:

<M/T> 5.3 L
<CVT> 5.4 L

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

9. Tighten the radiator cap securely.
10.Remove the radiator condenser tank cap, and

add the engine coolant up to the "F" line of the
level gauge.

Main

Index

Group

TOC