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That arrangement -- water flowing UP through the radiator -- ensures that all the water will flow through all the radiator all the time, no matter what might happen to the passages within the radiator.With water flowing DOWN through the radiator, internal obstructions or damage -- clogs or air/vapor bubbles, or holes where they shouldn't be -- can allow water to bypass most of the radiator and just flow directly through the short-circuit path of least resistance between inlet and outlet.
That arrangement -- water flowing UP through the radiator -- ensures that all the water will flow through all the radiator all the time, no matter what might happen to the passages within the radiator.
With water flowing DOWN through the radiator, internal obstructions or damage -- clogs or air/vapor bubbles, or holes where they shouldn't be -- can allow water to bypass most of the radiator and just flow directly through the short-circuit path of least resistance between inlet and outlet.
