Member
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Join Date: Dec 2019
Location: Ft Lauderdale
Posts: 182
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Member
Join Date: Dec 2019
Location: Ft Lauderdale
Posts: 182
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Don't overthink this.
Although the physics of the cooling system is complex, we need not go that far.
Basically the coolant expands as the engine warms up, the coolant goes thru the vacuum valve in the radiator cap and into the plastic overflow tank. The level will rise with a hot engine.
When the engine and coolant cool down and since the overflow hose is immersed in the overflow tank, a vacuum is created and the coolant is sucked back into the radiator/expansion tank.
This back and forth movement insures that the radiator/expansion tank is always completely full and void of an air.
It also insures that coolant is no longer spilled onto the ground.
And this is why the overflow tank should always have coolant covering the overflow hose, preferably at least at the min level, but not so much that it runs over to the ground.
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