small front grill area also and then the grill bars restrict about half of that--------------Whole truck as an aero object--little air flow into the engine bay where the carb/engine burns up a lot of that, then using air for the rear that is already super heated from the engine /exhaust-------then trying to pull air thru that rear rad with those two little fans(do you know the amps for them?????) that aren't mounted so as to shroud the whole core area--------

Plus probably an A/C evaporator in front of the front rad??????