TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 69 of 888
TM 9-2320-280-20-1
1-20. COOLING SYSTEM OPERATION (Cont'd)
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 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
- Actuates hydraulic control valve as required by coolant temperature.
WATER PUMP
- Driven by V-belts provides circulation of coolant through cooling system.
FAN CLUTCH
- Hydraulically actuated by pressure from hydraulic control valve to control
operation of fan. Hydraulic pressure supplied by power steering pump.
DRAINCOCK
- Draining point for radiator and cooling system.
RADIATOR SHROUD
- Permits a greater concentration of air to be pulled through the radiator.
1-39
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