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Hi Shortie,
you are doing much the same thing that I am about to start on, on my 2012 Ford F-150 truck. The truck has an open area (about 100 sq. in) below the bumper that I want to initially block off while I start blocking off small portions of the upper grill areas that are open to the radiator, and watch the UG display of the coolant temperature swings in this hot summer weather.
When I find out how much (if any) of the open areas I can block off in the upper grill and still keep things sufficiently cooled, I want to then close up the upper grill as much as possible per those results, and build a moveable/controllable shutter that will partially/fully block the lower opening when possible at highway speeds, and still keep the coolant temps under control.
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