TM 9-2320-209-10-1 e. Cooling System. The cooling system (fig. 2-6) is a sealed-type system made up of the radiator, fan, drive belts, thermostat, water pump , temperature gage, pressure-type filler cap, thermostat bypass line connecting the radiator to the engine, and the water pump. 1. Thermostat housing 2. Shroud 3. Radiator and cap 4. Fan and fan belt 5. Water pump Figure 2-6. Cooling System Components Location. 2-8