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there a couple of changes EMD made to their units as the newer models have come on line. One is that the radiators themselves are considerably larger, as well as the water tank is bigger. more water and larger surface area mean better cooling. also, if you notice on the SD70M's there is a third smaller radiator intake below the 2 big primary intakes on each side. also, although i don't know this for sure, i believe the fans themselves are bigger on the new units. as for the SD90MAC's, it's pretty obvious EMD at least somewhat, studied GE's intakes, although the entire design is a completely different principle than GE's. as a little side note, the 90MAC's and the AC6000's both use antifreeze instead of plain water with some treatment.
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