It will remain in the tank until it’s needed by the engine once again. Expanded coolant can go into the overflow tank to cool down. With the added overflow tank, the pressure is better regulated. An over-pressurized cooling system can lead to boiling liquid that can burst through any weak spot. If it were to become too hot, the fluid would expand, causing major issues in the sealed system. However, the amount of coolant in the overflow tank will vary based on how much is needed to cool the engine at the time.Īs long as the system works as designed, the coolant should never rise too high in temperature. On the other hand, if there’s too much pressure, coolant will be pulled from the cooling system back into the overflow tank.īecause the cooling system is a closed unit, the amount of coolant within the system should never change. When the level in the cooling system gets too low, coolant is withdrawn from the storage to enter the cooling system. Conclusion How Does a Radiator Coolant Overflow Tank Work?
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