![]() Hot engine temperatures cause coolant to expand from the radiator into the overflow tank through their connecting tube. In a cooling system with a radiator cap and separate overflow tank, the coolant can flow both ways. Yes, a radiator can pull coolant from the overflow tank. Related: Found Oil In Your Overflow Tank? (Here’s What That Means) Will a Radiator Pull Coolant From the Overflow Tank? So installing an overflow tank in your car is a good way to not only maintain the cooling system of your car but to save repairs and replacement expenses in the long run as well. In older vehicles with no coolant overflow bottle, the air is sucked into the radiator instead of coolant which results in the formation of rust. typical coolant overflow tankĭue to this vacuum, a vacuum valve in the radiator cap opens allowing the coolant which was flown into the radiator coolant overflow tank back into the radiator. This decrease in volume will result in a vacuum because of a drop in pressure. As it cools down, it will contract in volume as well. When the engine has been turned off, the coolant will start to cool down as well. See Also: Is It OK to Top Off Coolant With Water? ![]() When the pressure of the coolant in the radiator surpasses the designed pressure of the radiator cap, the antifreeze passes the radiator cap seal and flows into the coolant reservoir overflow tank through the overflow tube. When this coolant heats in the radiator, it begins to expand causing an increase in the pressure in the cooling system of that vehicle. The engine coolant absorbs the heat from the engine. When the engine is running at its optimum performance, it needs the engine coolant to keep it within the operational temperatures. The radiator overflow tank is fairly simple device but it can save you a lot of money by preventing rust from forming in the cooling system of your car. Related: Overfilled Your Coolant? (What Can Happen) How a Radiator Overflow Tank Works Let’s dive into the clever inner workings of the coolant overflow tank. It’s a fascinating relief valve that comes into play to help regulate your engine’s temperature. The overflow tank steps in to save the day, preventing coolant from bubbling over and making a mess. When engine heat makes the coolant expand, where does that excess fluid go? It’s an important cooling system component called the coolant overflow tank. That mysterious plastic tank next to the radiator is not just for show.
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