Originally Posted by shadow001
Only way i see it making a difference is the combination of having very thin hoses in and going upwards with the pump not being too great pressure/flow wise..
With the radiator in the second position, as least the hoses are level with the pump, so the pump should have it easier...The resistance of the radiator isn't much either way as it can allow much more fluid to pass thru it than the hoses could supply.
You do realize it's a closed loop and if the tubing is above or below the pump it will have no effect on flow.. right? The pump is sucking the same as it is pushing, gravity doesn't effect it. Gravity is also returning the fluid it pushed up.