TM 9-2320-272-101-18.POWER SYSTEM OPERATION (Contd)ASURGE TANK- Filling point for cooling system. On M939A2 vehicles, a float sensor monitors water leveland illuminates a light on instrument panel.BCOOLANT PRESSURE CAP- Designed to depressurize cooling system and to access cooling system forfilling.CWATER MANIFOLD- Collects coolant from cylinder heads and directs it to the thermostat housing (M939/A1series only).DSURGE TANK-TO-WATER MANIFOLD VENT- Vents air trapped in water manifold (M939/A1 series only).ESURGE TANK-TO-RADIATOR VENT- Vents air in cooling system.FTHERMOSTAT- Shuts off coolant flow to radiator until temperature reaches 175°F (79°C) on M939/A1series vehicles, and 181°F (83°C) on M939A2 series vehicles. Coolant is then directed to the radiatorthrough the radiator inlet hose.GRADIATOR INLET HOSE- Directs coolant from water manifold to radiator after thermostat has opened.HBYPASS TUBE- Directs coolant back to transmission oil cooler where it is then recirculated through theengine block until the thermostat opens.IRADIATOR SHROUD - Concentrates air flow through the radiator.JRADIATOR- Directs coolant through a series of fins or baffles so outside air can remove excessive heatfrom coolant.KFAN CLUTCH- Regulates use of fan to control engine temperature fan to belt driven pulley when conditionsrequire additional cooling.LWATER PUMP- Provides force to move coolant through engine.MFAN- Provides force to pull air through radiator.NRADIATOR DRAINVALVE- Permits coolant to be drained from radiator.OTRANSMISSION OIL COOLER HOSE- Directs coolant to transmission oil cooler.PENGINE OIL COOLER- Reduces heat of engine oil (M939/A1 series only).QTRANSMISSION OIL COOLER- Reduces heat of transmission oil.RENGINE OIL COOLER TO HEATER HOSE- Directs coolant to personnel water heater when shutoff valve isopen (M939/A1 series only).SPERSONNEL WATER HEATER- Provides heat for cab and personnel.1-43
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