I recomend NOT running one!
it doesnt give any more power, they are unpredictable, and unrelyable.
I went in the snow on saturday and it jammed up with snow and caused the fuse to blow. I got WAY hot and I didnt know why. I thought I wanted an electric fan until I got one. It is lagit too, not some ghetto install. I have a 2 speed electric fan for sale if you are interested. It is the same demensions as a stock fan shroud.