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To echo what [USER=30520]@Zoom[/USER] and [USER=26435]@Old Guy[/USER] said, thermodynamics actually have very little to do with radiator orientation, but if you don't actually have any real knowledge of thermodynamics it might sound good to put the hot hose on top simply because "heat rises, duh, silly engineers!", but in the real world that effect has a negligible effect on cooling system efficiency where flow is determined by the pump. In most cases, it's just way more convenient to have the hot water go in the top because that's closer to where the cylinder heads are with a standard front engine layout, and its more convenient to pull from lower down as it helps ensure the water pump won't try to suck air.Reversing the flow might make you feel good, but at the end of the day you aren't really accomplishing anything other than a smug sense of having "outsmarted" someone.
To echo what [USER=30520]@Zoom[/USER] and [USER=26435]@Old Guy[/USER] said, thermodynamics actually have very little to do with radiator orientation, but if you don't actually have any real knowledge of thermodynamics it might sound good to put the hot hose on top simply because "heat rises, duh, silly engineers!", but in the real world that effect has a negligible effect on cooling system efficiency where flow is determined by the pump. In most cases, it's just way more convenient to have the hot water go in the top because that's closer to where the cylinder heads are with a standard front engine layout, and its more convenient to pull from lower down as it helps ensure the water pump won't try to suck air.
Reversing the flow might make you feel good, but at the end of the day you aren't really accomplishing anything other than a smug sense of having "outsmarted" someone.
