theoretically sucking is better because it should help reduce dead zones a little bit and also thermal transfer from a solid (rad) to a fluid (air) is improved with lower pressure, if you blow then the air pressure in the rad is a tiny bit higher than if you suck.
in practice though it probaly depends more on the radiator design, just try both and see if you can stick with your "SEKS!" version without loosing out on to much.
slop
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