TM 5-2410-241-23-1
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COOLING SYSTEM CONTINUED
Figure 1. Cooling System Components and Flow Schematic.
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Coolant Temperature Regulator
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The coolant temperature regulator is located inside the temperature regulator housing (Figure 1, Item 3). The
coolant temperature regulator is a full flow bypass type regulator, which is used to control the outlet temperature of
the coolant. When the engine is cold, the regulator is in the closed position. This allows the coolant to flow from the
return manifold (Figure 1, Item 4), through the regulator, through the bypass tube (Figure 1, Item 6), which
bypasses the radiator (Figure 1, Item 5), and flow directly to the water pump (Figure 1, Item 7) for recirculation. As
the coolant temperature increases, the temperature regulator begins to open directing some of the coolant to the
radiator and bypassing the remainder to the water pump inlet. At the full operating temperature of the engine, the
regulator moves to the open position. This allows all the coolant flow to be directed to the radiator and then to the
water pump. This route provides the maximum heat release from the coolant. A vent line is provided from the
manifold to the radiator overflow tank in order to provide venting for the cooling system.
