I had installed an electric fan on my '03 FX4 while i was in Colorado. I moved to El Paso, TX where the summer temps are considerably higher. The fan i had quickly proved to be insufficient and i had to switch back to the clutch fan. Does anyone know a good single, or dual setup that will keepthe 4.0 cool in some extreme heat (90F-120F) and serious hard driving (wheeling in the sand dunes). thanks.