Actually, it's more like water pressure, not air pressure.
In order for any liquid to flow out of that system, there would have to be something to replace the water: as this is a closed system, there just isn't anything (unless there's a leak).
Now I call this a closed system, even though it has an air opening, because any coolant flowing one way, will be replaced by the same coolant coming back, simply because of the way the air trap is designed.
If however, the system wasn't closed (i.e. the fluid level got low enough to allow air in the system), then colant would flow down from the rad (sucking air in from the air trap), and level off at the top of the air trap.
so if the air trap can hold that much fluid, great. Otherwise, you've got a mess on your hands.
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