Mitsubishi L200. Manual — part 208

ON-VEHICLE SERVICE

ENGINE COOLING

14-4

ENGINE COOLANT REPLACEMENT

M1141001201921

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.

AC503674AC

Engine oil cooler

Water hose

Alternator

2. Drain the water in the water jacket by disconnect

the engine oil cooler water hose.

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.

5. Connect the engine oil cooler water hose.
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.

AC503144

MB991871

AB

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: DIA QUEEN SUPER

LONG LIFE COOLANT or equivalent

Quantity: 8.2 L
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

M1141001100631

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

Standard value: 30

− 60% (allowable concen-

tration 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.

WATER PUMP COOLANT LEAK CHECK

M1141008600392

If a residue of the coolant draining is found on the
drain hole, the vapour hole and the installation sur-
face of the water pump, check the water pump leak-
age by following method.
1. Wipe off the residue of the coolant draining on the

water pump.

ON-VEHICLE SERVICE

ENGINE COOLING

14-5

WARNING

Make sure that the coolant is cold when
removing the radiator cap.

2. Remove the radiator cap.

CAUTION

Do not pressures 100 kPa or more.

ACX01844

Cap adapter

Adapter

AC

3. Install the radiator tester and pressures at 100

kPa.

4. Hold the pressurized state for 20 minutes, and

check that the water leakage from the drain hole,
the vapour hole or the installation surface of the
water pump.

5. Remove the radiator tester, and install the radiator

cap.

6. Warm up the engine, let it idle for 20 minutes and

stop it.

7. Stop the engine.
8. Check that the water leakage from the drain hole,

the vapour hole or the installation surface of the
water pump.

9. If the water leakage is found in step 4 or 8,

replace the water pump (Refer to

P.14-9

).

RADIATOR FAN

ENGINE COOLING

14-6

RADIATOR FAN

REMOVAL AND INSTALLATION

M1141002100872

Pre-removal and Post-installation Operation
• A/C Compressor Drive Belt, Alternator and Power Steer-

ing Oil Pump Drive Belt Removal and Installation (Refer to

GROUP 11A

− Crankshaft Pulley ).

• Air Duct Removal and Installation (Refer to GROUP 15 −

Air Cleaner ).

AC805946 AB

1

5

3

11 ± 1 N·m

4

2

11 ± 1 N·m

Removal steps

1.

Cooling fan shroud cover

2.

Cooling fan and cooling fan clutch
assembly

3.

Water pump pulley

4.

Cooling fan

5.

Cooling fan clutch

Removal steps (Continued)

THERMOSTAT

ENGINE COOLING

14-7

THERMOSTAT

REMOVAL AND INSTALLATION

M1141002402631

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

P.14-4

).

• Air Cleaner Assembly Removal and Installation (Refer to

GROUP 15

− Air Cleaner ).

AC502980

AC507713

1

24 ± 3 N·m

AB

11 ± 1 N·m

2

4

5

3

2

Removal steps

<<A>>

>>

A

<<

1.

Radiator lower hose connection

2.

Battery wiring harness connection

3.

Harness bracket

4.

Water pump inlet hose fitting

5.

Thermostat

REMOVAL SERVICE POINT

<<A>> RADIATOR LOWER HOSE DISCONNEC-
TION

AC606081

Mating marks

AE

Make mating marks on the radiator lower hose and
the hose clip as shown to install them in the original
position. Disconnect the radiator lower hose.

INSTALLATION SERVICE POINT

>>A<< RADIATOR LOWER HOSE CONNECTION

AC606082

Protrusion

BB

Mating marks

Water pump inlet
hose fitting

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

water pump inlet hose fitting.

2. Align the mating marks on the radiator lower hose

and hose clamp, and then connect the radiator
lower hose.