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What causes pressure to cooling system to force water into overflow reservoir?
Wiki User
∙ 11y ago
Radiator pressure is caused by coolant expanding as it heats. The radiator cap allows that pressure to build until it reaches a certain point (determined by the manufacturer which is why it's important to use a proper cap for the vehicle) then a spring compresses and coolant is allowed past the cap seal. The coolant flows through a hose to the overflow tank.
Now here's the magic part. Back in the day, before reservoir tanks, that excess coolant just fell to the ground, wasted. Now, with the tank, the liquid is actually drawn back into the radiator as the engine (and coolant) cool. The result, an always full radiator
Cheers
Wiki User
∙ 11y ago
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