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This negitive air pocket at highway speeds is pure rubbish...stick your head out the window and spit forward and see if there is a negitive pocket to stop the snot from coming back.



Apples/oranges comparison, the radiator is not out in the unobstructed airstream. Lots of things in a car's design can affect the free airflow into the radiator and the outflow from it.



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a clutch fan does zip at high RPM..it slips..like a clutch



Yeah, it slips in the sense that is turning slower than the hub that drives it but it's still pulling air.

I, and many others have cured overheating at road speed by replacing the fan clutch and nothing else.

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