GENERAL DESCRIPTION
ENGINE COOLING14-2
GENERAL DESCRIPTIONM1141000100401
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 TOOLM1141000600279
ENGINE COOLING DIAGNOSIS
INTRODUCTIONM1141005300347
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 STRATEGYM1141005200340
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
NAMESUPERSESSION APPLICATION
MB991871
LLC changerGeneral service tool Coolant refilling