Here is the thread I started on the setup I made. As SVOboy said, its all done, but the mechanical end of my setup didn't work out so great (the door was binding and not actuating properly). So, that part needs to be redesigned. But, other than that, it seems to work great. Also note I never actually had it hooked up to the car yet to dial it all in to coolant temps, but that is relatively easy.
Arduino controlled actuated grill block