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TM 9-2320-366-20-1
Figure 1-15. Cooling System
a.  Cooling System. The pressurized cooling system protects the engine, transmission, and air compressor by
providing a means of dissipating heat generated during operation of the vehicle. The radiator pressure cap (1, Figure
1-15), in combination with the ethylene glycol-based antifreeze, effectively raises the boiling point of the coolant to well
above 212 F (100 C). The thermostat (2), located in a housing on the right side of the engine, helps the engine to
warm up quickly by remaining closed until the coolant temperature reaches approximately 180 F (82 C). When the
coolant reaches 199 F (93 C), the thermostat is fully open and coolant is circulated through the water jackets in the
engine to maintain the correct operating temperature for the engine. Coolant is drawn from the radiator (3), through
the transmission oil cooler (4), and circulated throughout the cooling system by the water pump (5). The water pump,
located on the front of the engine toward the right side, is driven by two V-belts from the crankshaft pulley.

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