The radiator overflow bottle works as a reservoir for the coolant, that would otherwise rise up and spill out of the radiator. The radiator tank offers a spring cap, that ensure a cap closed cooling system. The overflow bottle offers a closed cooling system for the coolant, that is less dangerous and more practical. When the pressure and the temperature rises, to the same level of the coolants, the cap spring is automatically activated; which allows for the heated liquid to to rise up to the overflow bottle. As the entire system is under a lot of pressure, the liquid is able to reach a higher temperature before it boils, and can further add to the effectiveness of the system. Before the invention of this system, mechanical fans were used to cool down the coolant. The radiator overflow bottle, provides the system a new flow, that is effective and safe.
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