TM 9-2320-280-20-11-38Change 11-20. COOLING SYSTEM OPERATIONThe cooling system removes excess heat from the engine, engine oil, transfer oil, and transmission oil. Thissystem is identical on all models covered in this manual. Major components of the cooling system are:BENGINE TEMPERATURE SWITCH – Sends signal to activate control valve system to operate fanwhen engine temperature exceeds 215°F (102°C) and deactivate when engine temperature dropsbelow 190°F (88°C).AENGINE TEMPERATURE SENDING UNIT – Sends signal indicating coolant temperature togauge on instrument cluster.DTHERMOSTAT – Shuts off coolant return flow to radiator until temperature reaches 190°F (88°C).Coolant is then directed to the radiator through the radiator inlet hose.CWATER CROSSOVER – Collects coolant from cylinder heads and channels it to the thermostathousing where it is redirected through the cooling system.ERADIATOR – Directs coolant through a series of fins and baffles so outside air can dissipate excessengine heat before the coolant is recirculated through the engine.FGHOIL COOLER – Directs engine oil (lower half of cooler) and transmission oil (upper half of cooler)through a series of fins or baffles 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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