The liquid stays there long enough to cool. Once it exceeds that level, the coolant passes the radiator cap seal and spills into the overflow tube, and then flows into the coolant overflow tank. The radiator cap is designed to contain a certain pressure. The vapor flows back to the radiator, exchanges heat with the air in the radiator, and cools, returning to liquid form. The system finds a way to release the excess tension from the radiator. This volume expansion also increases the radiator’s pressure and the cooling system. When the coolant liquid absorbs heat from the engine, it expands, increasing volume. The coolant overflow tank is a device in the car cooling system that stores excess overflowing coolant liquid. The friction between engine parts also constitutes substantial heat that has to be removed, so the engine doesn’t overheat. Heat is also a product of that combustion reaction in the engine. The car engine burns fuel to produce energy that powers the vehicle.
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