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I’ve found if you leave both open eventually the air will move with the flow can’t explain why it moves
Close one the air stays and leaves a nice pocket
Air does diffuse into water so I suspect that by keeping the same water in the rad it'll only absorb so much before its saturated with air and stays stable. If it's got a constant replenishment of heating water going through it might lose the trapped air faster. In reality I'm not sure how fast the air does diffuse to water but that could be the reason?