TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 67 of 1207
TM 9-2320-361-20
1-19. POWER SYSTEMS OPERATION (Contd)
f. Cooling System Operation.
The cooling system removes excess heat from the engine. Major components of the cooling system are:
ENGINE OIL COOLER
- Removes excess heat from engine oil.
TEMPERATURE GAGE SENDING UNIT
- Detects temperature of engine coolant and sends an
electrical signal to temperature gage 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 pressurize.
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.
1-54
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