Mitsubishi Evolution X. Manual - part 232

SPECIAL TOOLS

TSB Revision

ENGINE COOLING

14-15

MB991223

a: MB991219
b: MB991220
b: MB991221
d: MB991222

Harness set

a: Test harness
b: LED harness
c: LED harness adaptor
d: Probe

General service tools

Checking the continuity and 
measuring the voltage at the 
harness connector

MB992006
Extra fine probe

General service tool

Continuity check and 
voltage measurement at 
harness wire or connector 
for loose, corroded or 
damaged terminals, or 
terminals pushed back in 
the connector.

MB991871
LLC changer

General service tool

Coolant refilling

MB992042
Water temp sensor 
wrench

MB992042-01

Engine coolant temperature 
sensor removal and 
installation

Tool

Tool number and name Supersession

Application

MB991223

a

d

c

b

DO NOT USE

BF

MB992006

AB

MB991871

MB992042

ON-VEHICLE SERVICE

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ENGINE COOLING

14-16

ON-VEHICLE SERVICE

ENGINE COOLANT LEAK CHECK

M1141001000849

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 moisture from 

the places checked.

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

coolant.

• Be careful when installing and removing the tester and 

when testing not to deform the filler neck of the radia-
tor.

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

radiator tester and apply 160 kPa (23 psi) 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 OPENING PRESSURE CHECK

M1141001301003

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 (12 psi)
Standard value: 93 

− 123 kPa (14 − 18 psi)

3. Replace the radiator cap if the reading does not remain at or 

above the limit.

ACX01844AE

Cap adapter

Adapter

ACX01845

Cap adapter

AD

ON-VEHICLE SERVICE

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ENGINE COOLING

14-17

ENGINE COOLANT CHANGE

M1141001201459

Required Special Tool:

• MB991871: LLC changer

1. Remove the engine room under cover front A (RH). (Refer to 

GROUP 51, Under Cover 

P.51-16

)

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

2. Drain the water from the radiator, heater core and engine 

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

3. Remove the engine room under cover front B. (Refer to 

GROUP 51, Under Cover 

P.51-16

)

4. Remove the air cleaner intake hose. (Refer to GROUP 15, 

Air Cleaner 

P.15-10

)

5. Remove the turbocharger compressor bracket. (Refer to 

GROUP 15, Exhaust Manifold and Turbocharger Assembly 

P.15-16

)

6. Disconnect the turbocharger water return hose and drain the 

coolant in the water jacket.

7. Remove the radiator condenser tank and drain the coolant.
8. Drain the coolant then clean the path of the coolant by 

injecting water into the radiator from the radiator cap area.

9. Connect the turbocharger water return hose.
10.Securely tighten the drain plug of the radiator.
11.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 
aluminum components.
12.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 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 (−23.8 ° F)].

Recommended antifreeze: Long Life Antifreeze 

Coolant or an equivalent

Quantity: 7.5 dm

3

 (7.9 quarts)

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

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

engine coolant up to the "FULL" line.

AC706501AC

Turbo charger 
air inlet fitting

Turbo charger 
water return hose

AC705466AC

MB991871

Air hose

ON-VEHICLE SERVICE

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ENGINE COOLING

14-18

15.Turn the A/C switch to OFF position to start the engine and 

warm up until the cooling fan operates.
NOTE: This step opens the thermostat fully.

16.Rev the engine several times and then stop it. Check that 

there are no coolant leaks.

17.Remove the radiator cap with the engine cool, and then refill 

the engine coolant up to the top of the radiator port.

18.Tighten the radiator cap securely.

CAUTION

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

engine coolant up to the "FULL" line.

20.Install the turbocharger compressor bracket. (Refer to 

GROUP 15, Exhaust Manifold and Turbocharger Assembly 

P.15-16

)

21.Install the air cleaner intake hose. (Refer to GROUP 15, Air 

Cleaner 

P.15-10

)

22.Remove the engine room under cover front B and engine 

room under cover front A (RH). (Refer to GROUP 51, Under 
Cover 

P.51-16

)

WATER PUMP COOLANT LEAK CHECK

M1141008600080

If a residue of the coolant draining is found on the drain hole, 
the vapor hole and the installation surface, check the water 
pump leakage by following method.
1. Wipe off the residue of the coolant draining on the water 

pump.

WARNING

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

2. Remove the radiator cap.

CAUTION

Do not pressures 100 kPa (15 psi) or more.
3. Install the radiator tester and pressures at 100 kPa (15 psi).
4. Hold the pressurized state for 20 minutes, and check that 

the water leakage from the drain hole, the vapor 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. After stopping the engine, and check that the water leakage 

from the drain hole, the vapor hole or the installation surface 
of the water pump.

8. If the water leakage is found in step 4 or 7, replace the water 

pump. (Refer to 

P.14-25

.)

ENGINE COOLANT CONCENTRATION TEST

M1141001101009

Refer to GROUP 00 

− Recommended Lubricants and Lubricant 

Capacities Table 

P.00-56

.

ACX01844AE

Cap adapter

Adapter