TM-9-2320-387-24-1

TRUCK, UTILITY: S250 SHELTER CARRIER, 4X4, M1113

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE, VOLUME 1

DECEMBER 1997
CHANGE 1
TM-9-2320-387-24-1

  TM-9-2320-387-24-1 - Page 51 of 1205

TM 9-2320-387-24-l
1 l-20.
COOLING SYSTEM OPERATION (Cont’d)
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FAN -
Pulls outside air through radiator to remove heat from coolant.
HYDRAULIC
CONTROL VALVE -
Directs hydraulic fluid to provide required pressure to actuate
fan clutch as required by engine temperature. Hydraulic pressure is supplied by power steering
pump.
TIME DELAY MODULE -
Sends delayed signal to fan clutch solenoid for delay of fan actuation to
provide needed horsepower for engine acceleration.
FAN
CLUTCH SOLENOID
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Actuates hydraulic control valve as required by coolant temperature.
WATER PUMP - Driven by serpentine belt, provides circulation of coolant through cooling system.
FAN CLUTCH - Hydraulically actuated by pressure from hydraulic control valve to control
operation of fan. Hydraulic pressure is supplied by power steering pump.
DR.AINVAIXE - Draining point for radiator and cooling system.
RADIATOR SHROUD - Permits a greater concentration of air to be pulled through the radiator.
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