Mitsubishi 380. Manual — part 229
NOTES
14-1
GROUP 14
ENGINE COOLING
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
SPECIAL TOOL . . . . . . . . . . . . . . . . .
ENGINE COOLING DIAGNOSIS . . . .
INTRODUCTION. . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING STRATEGY . . . . . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
ENGINE COOLANT LEAK CHECK . . . . . .
RADIATOR CAP PRESSURE CHECK. . . .
ENGINE COOLANT REPLACEMENT . . . .
ENGINE COOLANT CONCENTRATION TEST
FAN CONTROLLER CHECK . . . . . . . . . . .
FAN CONTROL RELAY CONTINUITY CHECK
RADIATOR . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
THERMOSTAT . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
WATER PUMP . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
WATER HOSE AND WATER PIPE . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATION . . . . . . . . . . . .
CAPACITIES . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL DESCRIPTION
ENGINE COOLING
14-2
GENERAL DESCRIPTION
M1141000100401
• 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, pres-
sure forced circulation type in which the water
pump pressurizes coolant and circulates it
throughout the engine. If the coolant temperature
exceeds the prescribed temperature, the thermo-
stat 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 type and is driven by
the drive belt from the crankshaft. The radiator is
the corrugated fin, down flow type.
SPECIAL TOOL
M1141000600279
ENGINE COOLING DIAGNOSIS
INTRODUCTION
M1141005300347
The system cools the engine so that it does not over-
heat and maintains the engine at an optimum tem-
perature. The system components are the radiator,
water pump, thermostat, condenser and fan assem-
blies. Possible faults include low coolant, contamina-
tion, belt loosening and component damage.
TROUBLESHOOTING STRATEGY
M1141005200340
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure to find
most of the engine cooling faults.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Find and repair the malfunction by following the
SYMPTOM CHART.
4. Verify that the malfunction is eliminated.
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991871
LLC changer
General service tool
Coolant refilling
MB991871
ENGINE COOLING DIAGNOSIS
ENGINE COOLING
14-3
SYMPTOM CHART
M1141005600393
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Coolant Leak
DIAGNOSIS
STEP 1. Check for coolant leaks.
WARNING
When pressure testing the cooling system, slowly
release cooling system pressure to avoid being
burned by hot coolant.
CAUTION
• Be sure to completely clean away any moisture from
the places checked.
• When the tester is removed, be careful not to spill any
coolant.
• When installing and removing the tester and when test-
ing, be careful not to deform the filler neck of the radia-
tor.
Check that the coolant level is up to the filler neck. Install a radi-
ator tester and apply 160 kPa (23 psi) pressure, and then check
for leakage from the radiator hose or connections.
Q: Is leakage present from the radiator hose or
connections?
YES : Repair or replace the appropriate part, then go to
Step 2.
NO : There is no action to be taken.
STEP 2. Retest the system.
Q: Is there still coolant leakage?
YES : Return to Step 1.
NO : The procedure is complete.
SYMPTOM
INSPECTION
PROCEDURE
REFERENCE
PAGE
Coolant leak
1
Engine overheating
2
Radiator fan and condenser fan do not operate
3
Radiator fan and condenser fan do not change speed or stop
4
Radiator fan does not operate
5
Condenser fan does not operate
6
ACX01844 AB
CAP ADAPTER
ADAPTER
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