nytrdr24
+1y
one of the dual 12's will be more than sufficient to cool the truck, especially on a stock motor, or even a built one like mine. if you wanted to run two seperates with one in front of the condensor, and one behind the rad, they would have to move the same cfm & turn the same direction (which will actually mean one would have to be a pusher, and one a puller),
otherwise you'll end up burning one up because they will be working against each other, not to mention that would decrease their effectiveness, and probably not cool the engine like it should.....my f-a-lite has a seperate thermo, just set it at w/e temp you want the fan to kick on at. then you use a switched hot to pull in the relay, be it from an ignition hot that you've put an inline switch on, or you can use one of the existing circuits such as the thermo sensor for the a/c, that way when the a/c kicks in it will come on, or if the temp goes above w/e temp you set the thermo at, it will come on.