TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 72 of 1176
TM 9-2320-361-24-1
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THEORY OF OPERATION (Contd)
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COOLING SYSTEM
Cooling System Operation:
The engine cooling system is a pressurized, thermostatically controlled
system consisting of a radiator, thermostat, water pump, fan, and hoses. The major components of the
cooling system are as follows:
ENGINE OIL COOLER
– Removes excess heat from engine oil.
ENGINE TEMPERATURE SENDING UNIT
– Detects temperature of engine coolant and sends an
electrical signal to temperature gauge on instrument panel.
THERMOSTAT
– Shuts off coolant flow to radiator until temperature reaches 180°F (82°C). Coolant
is then allowed to flow to the radiator through the upper radiator hose.
RADIATOR FILLER CAP
– When removed, filler neck serves as filling point for cooling system.
When installed, cap allows cooling system to be pressurized.
RADIATOR
– Directs coolant through a series of fins or baffles so outside air can remove excess
heat from coolant.
UPPER RADIATOR HOSE –
Directs coolant from engine block to radiator when thermostat opens.
FAN
– Pulls outside air through radiator to remove excess heat from coolant.
WATER PUMP
– Circulates coolant through cooling system.
LOWER RADIATOR HOSE
– Directs coolant from radiator back to engine block.
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