Fan Settings.

Ive never seen a setting/way to do that.

I guess it would help to cool down the radiator after you shut off your car to help get some of the heat out of there, but I dont see what the deal exactly with doing it is, I mean If it needed it I think ford would put that on there somehow and its been fine/I havent noticed any problems/concerns with it for 12 years?
 
Ok......When I turned of my car, I was about 190*, went to the store about 30 minutes to an hour. Got back in started it and it was at 210. So I wired up the low fan to a switch. Made it work, now I did the same thing. turned the car of at 190 left it alone but now with the switch on. This time it was around 18o-185. So It does have a good affect. I hooked it up with a fuse that way it could pop it if it gets to hot or something goes wrong with the wiring