What part of the cooling system helps to dissipate heat after the coolant has circulated through the engine?

The radiator is an essential component of the cooling system in vehicles, including the Medium Tactical Vehicle Replacement (MTVR). Its primary function is to dissipate heat from the engine coolant after it has circulated through the engine. As the coolant absorbs heat from the engine, it becomes hot and then flows to the radiator, where it is cooled down.

Inside the radiator, the hot coolant passes through a series of thin tubes while air flows over the exterior of the radiator, typically assisted by a fan. This air flow facilitates the transfer of heat from the coolant to the outside atmosphere, effectively lowering the temperature of the coolant before it is recirculated back to the engine. This cooling process is vital to prevent the engine from overheating and ensures that it operates efficiently.

In contrast, the water pump is responsible for circulating the coolant throughout the engine and cooling system but does not directly dissipate heat. The expansion tank and coolant reservoir serve important functions in maintaining the coolant level and accommodating changes in coolant volume due to temperature fluctuations, but they also do not play the role of dissipating heat. Therefore, the radiator is the crucial component responsible for cooling the heated coolant and maintaining optimal engine temperature.