The article is claiming that the ducts on top are the air exit ducts... and in the photos of the fan, there is no radiator visible under the fan.
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But the air coming out of the rear diffuser beneath the bumper isn’t going out, it’s going up. VW managed to channel the air out the splitter, through the engine compartment and then suck it out through a top-mounted fan. It’s a concession to the Gods of aerodynamics that wouldn’t work with massive side ducts like you’d seen on the 911 Turbo.
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If the engine is water-cooled, and if the air flow is exiting at the top, then I would expect the radiator to be located at (near) the entrance of the air, toward the bottom of the engine.
It is hard to tell in this pic what the 3 blue-capped reservoirs are for, but if you look between the fan and the blue cap on the bottom left, it looks like there *might* be a radiator way down in there. That, and the shape of the fan blades does seem to indicate that the air flow is coming upwards...