Mudrat wroteElectric fans allow all sorts of options - including thermal engagement as well as an on/off switch for water crossings =D>
This is the way I need to go on my J20 plowtruck, had to rig a locked clutch to keep it cool on the road with the plow on, I'm tired of swapping it out fall and spring, I need t do the high mount alt with an upgraded alt to have juce to run a fan and keep the belts farther up out of the snow.