Radiator Overflow Tank: Why Is It Important? Here’s a great video explaining how the car’s cooling system works: This vacuum will then draw the coolant back into the radiator, ready to circulate it once again the next time you drive the car. As the pressure decreases, it will create a vacuum in the system. As a result, pressure remains regulated, the temperature will remain optimal, the cooling system runs smoothly, and your engine won’t overheat.Īfter you drive the car, the system will shut off and pressure will decrease. This opens a passageway for excess coolant to flow through a hose and into the overflow or reservoir tank. When the system reaches a certain amount of pressure, it will push the valve on the radiator cap. When pressure and temperature increase, the coolant will expand, essentially increasing the amount of coolant in the system. As the system warms up, the pressure inside the system will increase. Not only this helps to keep the coolant in place, but it also helps to regulate pressure inside the system since the cap has a valve. Well, you may notice your radiator has a cap on top of it. It’s usually made from plastic, also sometimes called the reservoir or recovery tank, but how does it work? So, what’s the overflow tank for then? As the name suggests, this tank is used to store overflowing coolant. What’s The Radiator Overflow Tank Is For Then? This sensor feeds it into your car and displays it on the temperature gauge. There’s also a temperature sensor that sits somewhere near the thermostat which detects the coolant’s temperature. The water pump will then pump the cooled coolant from the radiator back into the engine to absorb heat away once again. The radiator has a series of fins – usually made from aluminum – and a fan that’s blowing through it to disperse heat from the coolant. This allows the hot coolant to flow into the radiator, where it will cool down. The purpose is to get the engine to operating temperature as quickly as possible.Īfter the coolant reaches a higher temperature – usually around 160☏ – the bypass valve will close, and the main valve opens. This bypass valve recirculates the coolant that was in the engine and feeds it straight back into the engine. After you turn on the engine, if the engine is still cold, the thermostat will keep the bypass valve open. The system starts with the thermostat, which is a valve that regulates coolant flow. The system works by circulating coolant fluid through the engine to absorb the heat away from it. Conclusion How The Cooling System Worksīefore we get into the radiator overflow tank, let’s understand how the cooling system works first just in case you didn’t know.We’ll be discussing everything about the radiator overflow tank in this post, and the cooling system in general itself. The cooling system itself is very complex, and one of the parts that may seem minor but are very important is the radiator overflow tank. And it’s the job of the cooling system to make sure that the engine doesn’t exceed operating temperature. An internal combustion engine runs off a series of controlled explosions, so obviously it runs hot.
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