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So your fan coming on every 2 miles isn't because there is a venture effect at the grill, it is because you put in a switch to turn the fan on at 195 degrees.
My engine runs constant at about 185-195. Why did you choose to have the fan kick in at that temp?
It sounds like you have some problem that needs to be fixed. And, the stock setup fan spins too when not engaged or disengaged.
I wouldn't just assume that a venturi effect is making your HMMWV got hot so fast.