TM-9-2320-366-10-1 MTV Operator Manual M1083 Series - Volume 1 Download
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TM 9-2320-366-10-1 1-17. COOLING SYSTEM Figure 1-22. Cooling System The Cooling System protects the engine, transmission, and air compressor by providing a means of removing the heat generated during operation of the vehicle. (1) The radiator pressure cap (1, Figure 1-22), in combination with the ethylene glycol- based antifreeze, effectively raises the boiling point of the coolant to well above 212°F (100°C). (2) The thermostat (2) helps the engine to warm up quickly by remaining closed until the coolant temperature reaches approximately 199°F (93°C). When the coolant temperature reaches approximately 199°F (93°C), the thermostat opens and coolant is circulated through the water jacket 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 through the cooling system by the water pump (5). Heat is drawn from the radiator by the engine fan pulling air over the radiator cooling fins. (3) A radiator overflow tank (6) is provided to allow for expansion of the coolant. The radiator overflow tank also serves as the point where new coolant is introduced into the cooling system. The radiator overflow tank has two sight glasses; the upper sight glass (7) indicates the level to fill to with engine shut down. If coolant is not visible in the lower sight glass (8), do not operate the vehicle. 1-56