TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 51 of 1205
TM 9-2320-387-24-l 1 l-20. COOLING SYSTEM OPERATION (Cont’d) 1 0 I 0 J 0 K 0 L 0 M 0 N 0 0 0 P 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 - 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. 1-27