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The fans in the newer water cooled cars (Porsche and non-Porsche) do not blow on the engine - they blow through the radiator. In the end, the air contacting the engine is hot after ambient air is blown through the radiator. The purpose of fans continuing to blow after engine shutdown is to cool the hot water that is now sitting without movement in the radiator, thus reducing thermal wear on the cooling system - it has nothing whatsoever to do with cooling the engine itself.
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