auto radiators has virtualy 0 flow resistance, espesialy at the flow rates we use... so no..... the pump will not have any trouble at all getting the water through the rad..... priming the thing, however, is a complete other story... The radiators I think of as being deasant, holds at least 10l of liquid in them....
you will probably use the rad as the reservoir, with it's filler cap being the highest possible point in the cooling loop, that way the completed rig will prime itself, as you fill it up... obviously having the pump right at the bottom.
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