Sure you could potentially calculate it if you measured everything, ambient temps included, but we don't know how effecient radiator are other than the ones BillA tested. But then again, most people mount their heatercores to their cases so using the ambient temperature wouldn't necessarily be accurate and you're back to a theoretical number that you'll likely never see. You'd also have to measure flow rate and coolant temps ahead of time, something you can't do without already having the radiator in hand.
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