Take a look at Vintage Air out of Texas, They make a 18" monster 3700 cfm electric fan . I have one. I originally had a 16" Black magic fan. It did not quite get it durring the summer. Switched to the Vintage Air unit and now I can idle around in 100 deg. heat and engine temp stays at 195 deg. ( I am running 180 deg. therm). Give it a look see.....