2005 MITSUBISHI 380 radiator cap

14-1
GROUP 14
ENGINE COOLING
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .14-2
SPECIAL TOOL . . . . . . . . . . . . . . . . .14-2
ENGINE COOLING DIAGNOSIS . . . .14-2
INTRODUCTION. . . . . . . . . . . . . . . . . . . . . 14-2
TROUBLESHOOTING STRATEGY . . . . . . 14-2
SYMPTOM CHART. . . . . . . . . . . . . . . . . . . 14-3
SYMPTOM PROCEDURES . . . . . . . . . . . . 14-3
ON-VEHICLE SERVICE . . . . . . . . . . .14-26
ENGINE COOLANT LEAK CHECK . . . . . . 14-26
RADIATOR CAP PRESSURE CHECK . . . . 14-27
ENGINE COOLANT REPLACEMENT . . . . 14-27
ENGINE COOLANT CONCENTRATION TEST14-29
FAN CONTROLLER CHECK . . . . . . . . . . . 14-29
FAN CONTROL RELAY CONTINUITY CHECK14-31
RADIATOR . . . . . . . . . . . . . . . . . . . . .14-32
REMOVAL AND INSTALLATION . . . . . . . . 14-32
THERMOSTAT . . . . . . . . . . . . . . . . . .14-35
REMOVAL AND INSTALLATION . . . . . . . . 14-35
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 14-38
WATER PUMP . . . . . . . . . . . . . . . . . .14-39
REMOVAL AND INSTALLATION . . . . . . . . 14-39
WATER HOSE AND WATER PIPE . .14-40
REMOVAL AND INSTALLATION . . . . . . . . 14-40
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 14-41
SPECIFICATIONS . . . . . . . . . . . . . . .14-42
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 14-42
SERVICE SPECIFICATION . . . . . . . . . . . . 14-43
CAPACITIES . . . . . . . . . . . . . . . . . . . . . . . . 14-43
SEALANTS . . . . . . . . . . . . . . . . . . . . . . . . . 14-43

ENGINE COOLING DIAGNOSIS
ENGINE COOLING14-4
INSPECTION PROCEDURE 2: Engine Overheating
DIAGNOSIS
STEP 1. Remove the radiator cap and check for coolant
contamination.
Q: Is the coolant contaminated with rust and oil?
YES : Replace it. Refer to P.14-27.
NO : There is no action to be taken. Go to Step 2.
STEP 2. Check the radiator cap valve opening pressure.
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 gauge indicator stops
moving.
Minimum limit: 83 kPa (12 psi)
Standard value: 93
123 kPa (14 18 psi)
Q: Does the reading remain at or above the minimum limit?
YES : Go to Step 3.
NO : Replace the radiator cap. Then go to Step 5.
STEP 3. Check thermostat operation.
Refer to 38.
Q: Does the thermostat operate correctly?
YES : Go to Step 4.
NO : Replace the thermostat, then go to Step 5.
STEP 4. Check the drive belt for slippage or damage.
Refer to GROUP 00, Maintenance Service
Drive Belts
(Check Condition). <3.8L Engine>39 .
Q: Is the drive belt loose or damaged?
YES : Adjust or replace the drive belt, then go to Step 5.
NO : There is no action to be taken.
STEP 5. Retest the system.
Check the engine coolant temperature.
Q: Is the engine coolant temperature abnormally high?
YES : Return to Step 2.
NO : The procedure is complete.

ON-VEHICLE SERVICE
ENGINE COOLING14-27
RADIATOR CAP PRESSURE CHECKM1141001300419
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.
ENGINE COOLANT REPLACEMENTM1141001200478
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.
1. Drain the water from the radiator, heater core and engine
after unplugging the radiator drain plug and removing the
radiator cap.

ON-VEHICLE SERVICE
ENGINE COOLING14-28
2. Drain the water in the water jacket by unplugging the drain
plug of the cylinder block.
3. Remove the radiator condenser tank assembly 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
AAD Part No.8731 or equiva-
lent
Tightening torque:
39
5 Nm
6. Securely tighten the radiator drain plug.
7. Assemble the radiator condenser tank assembly.

ON-VEHICLE SERVICE
ENGINE COOLING14-29
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.
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 MB991871 to refill the
coolant. A convenient mixture is a 50 % water and 50 %
antifreeze solution [freezing point:
31C (32.8 F)].
Recommended antifreeze: Long Life Antifreeze
Coolant or an equivalent
Quantity:
8.7 Litres
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, stop the engine.
12.Remove the radiator cap after the engine has cooled, and
pour in coolant up to the brim. Reinstall the cap.
Do not overfill the radiator condenser tank assembly.
13.Add coolant to the radiator condenser tank assembly
between the "FULL" and "LOW" mark if necessary.
ENGINE COOLANT CONCENTRATION TESTM1141001100396
Refer to GROUP 00, RECOMMENDED LUBRICANTS AND
LUBRICANT CAPACITIES TABLE 35.
FAN CONTROLLER CHECKM1141007400113
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

THERMOSTAT
ENGINE COOLING14-36
14. ENGINE COOLANT
TEMPERATURE SENSOR
CONNECTOR
15. CAPACITOR CONNECTOR
16. CAMSHAFT POSITION SENSOR
CONNECTOR
17. INHIBITOR SWITCH SENSOR
CONNECTOR
18. A/T CONTROL SOLENOID VALVE
ASSEMBLY CONNECTOR
19. OUTPUT SHAFT SPEED
SENSOR CONNECTOR
20. INPUT SHAFT SPEED SENSOR
CONNECTOR REMOVAL STEPS (Continued)
REMOVAL STEPS
<> >>B<<21. RADIATOR LOWER HOSE
CONNECTION22. WATER INLET FITTING>>A<<23. THERMOSTATREMOVAL STEPS (Continued)