Mitsubishi Grandis. Manual - part 811

ON-VEHICLE SERVICE

ENGINE COOLING

14-17

RADIATOR CAP VALVE OPENING 
PRESSURE CHECK

M1141001300464

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

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: 83 kPa
Standard value: 93 

− 123 kPa

3. Replace the radiator cap if the reading does not 

remain at or above the limit.

ENGINE COOLANT REPLACEMENT

M1141001200575

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 counterclockwise a little to let the 
pressure escape through the vinyl tube. 
After relieving the steam pressure, remove 
the cap by slowly turning it 
counterclockwise.

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

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

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.

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: 44 

± 5 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 
components.

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:

<Without rear heater> 8.0 L
<With rear heater> 9.5 L

AC211643 AB

Cap adapter

AC302106

Cylinder block
drain plug

AC

AC304677

Cylinder block
drain plug

AE

AC302096

AC

MB991871

Air hose

ON-VEHICLE SERVICE

ENGINE COOLING

14-18

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

M1141001100459

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

Standard value: 30 

− 60% (allowable 

concentration 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 
concentration 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.

FAN CONTROLLER CHECK

M1141007400102

1. Remove the fan controller connector.
2. Turn the ignition switch to the "ON" position, and 

measure the voltage between the harness-side 
connector terminals.

Standard value: System voltage

3. Connect the fan controller connector, and 

disconnect the condenser fan motor connector.

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

engine and run it at idle.

5. Measure the voltage between the fan 

controller-side connector terminals.

Standard value: 1V or less

WARNING

Stay clear of the fan when the fan starts 
running.

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

controller-side connector terminals while the fan is 
running. The voltage should repeat the values 
below.

Standard value:

8.2 

± 2.6 V

System voltage 

± 2.6 V

8. If the voltage does not repeatedly change as 

indicated, replace the cooling fan motor and fan 
controller.

AC302093 AE

2

3

1

Fan controller

AC302093

2

1

AF

Fan controller

ON-VEHICLE SERVICE

ENGINE COOLING

14-19

FAN CONTROL RELAY CONTINUITY 
CHECK

M1141006200365

1

3

4

2

3

4

1

2

AC310978

AC303951

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

14-20

THERMOSTAT

REMOVAL AND INSTALLATION

M1141002400550

REMOVAL SERVICE POINT
<<A>> RADIATOR LOWER HOSE/HOSE 
CLIPS DISCONNECTION

Break off the tip of hose clip claw and spread out the 
hose clip, then disconnect the radiator hose.
NOTE: If there is a hose clip claw, the hose clip 
cannot spread to capacity because the claw contacts 
the hose clip.

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

P.14-17

).

• Air Cleaner Removal and Installation (Refer to GROUP 

15, Air Cleaner 

P.15-3

).

• Battery Removal and Installation

AC302092

1

2

3

3

4

4

5

6

11 ± 1 N·m

11 ± 1 N·m

13 ± 2 N·m

AD

N

Removal steps

<<A>>

>>B<<

1.

Radiator lower hose connection

<<A>>

>>B<<

2.

Hose clips

3.

Engine control harness clamp

4.

Engine control harness clamp 
bracket

5.

Water inlet fitting

>>A<<

6.

Thermostat

AC302615

Hose clip

Claw (Tip)

AE