superart,
It is very unlikely that there would be more than a couple of degrees difference in coolant temperature either side of the rad, provided flow rates are adequate.
If you want to have separate loops, then don't forget you will need a much larger pump in order to get significatn flow rates through each component, and this larger pump will add a lot more heat to the system.
8-ball
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For those who believe that water needs to travel slowly through the radiator for optimum performance, read the following thread.
READ ALL OF THIS!!!!
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