TM-9-2320-387-10
TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113
OPERATOR’S MANUAL
OCTOBER 2001
CHANGE 1
TM-9-2320-387-10 - Page 30 of 277
TM
9-2320-387-10
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- 17. COOLING SYSTEM OPERATION
The cooling system removes excess heat from the engine, engine oil, transfer case
oil, and transmission oil. Major components of the cooling system are:
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ENGINE TEMPERATURE
SENDING UNIT -
Sends signal indicating
coolant temperature to gauge on instrument cluster.
ENGINE TEMPERATURE
SWITCH -
Sends signal to activate control
valve system to operate fan when engine temperature exceeds 220°F (104°C)
and deactivates control valve system when engine temperature drops below
190°F (88°C).
WATER CROSSOVER
-
Collects coolant from cylinder heads and channels
it to the thermostat housing where it is redirected through the cooling
system.
THERMOSTAT
-
Shuts
flow to radiator until
temperature
190°F (88°C). Coolant is
directed
inlet hose.
RADIATOR -
Directs coolant through a series of fins and bafIles so outside
air can dissipate excess engine heat before the coolant
is
recirculated
through the engine.
OIL
COOLER -
Directs engine oil (lower half of cooler) and transmission
oil (upper half of cooler) through a series of fms or bafIles so outside air can
remove heat from oil.
SURGE TANK -
Filling and expansion point for cooling system.
PERSONNEL
HEATER -
Provides heat for personnel and interior of
vehicle.
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