![]() ![]() Low coolant levels or running with aged coolant are common problems that are observable in cars. In winters, coolant aids in lowering the freezing point and, in turn, increasing the boiling point of the liquid, thus the name “antifreeze.” Why Is Coolant Disappearing From Reservoir Secretively? In summers, the coolant helps in deviating heat away from the car’s engine so that the running mechanical block maintains it cool. What Does A Coolant Do?Ĭoolant is not only a liquid that comes useful in summers but winters as well. Has this happened with your car too? Let’s bust the mystery for you so that you don’t scratch your heads in contemplation the next time. The mystery arises though when magically the coolant disappearing from reservoir is noticed with no potential signs of leakage. There may be times when the coolant system may fail due to one reason or another. ![]() When the radiator cools back down, a vacuum is created in the cooling system that pulls open another spring loaded valve, sucking water back in from the bottom of the overflow tank to replace the water that was expelled.Call it antifreeze, a coolant, or even radiator fluid the purpose is to maintain the engine’s cool. This arrangement keeps air out of the system. This coolant flows through the overflow tube into the bottom of the overflow tank. When the pressure reaches 15 psi, the pressure pushes the valve open, allowing coolant to escape from the cooling system. The cap is the only place where this pressure can escape, so the setting of the spring on the cap determines the maximum pressure in the cooling system. When the fluid in the cooling system heats up, it expands, causing the pressure to build up. The boiling point of water increases when the water is placed under pressure. The cap is actually a pressure release valve, and on cars it is usually set to 15 psi. How does this simple cap do this? The same way a pressure cooker increases the boiling temperature of water. ![]() The radiator cap actually increases the boiling point of your coolant by about 45 F (25 C). ![]()
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