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I get what you say and no issues on build it your way. For me... it is the heartbeat of the HumV. If I don't hear it roaring something is UP. On the same DIY mod's, I have a light that comes on when the fan is engaged. (came off of heater. moving the brake lamp to the center was a good idea...

If cooling system is working correctly, cycling as is should... what would the need for a bypass / over ride switch. Worst case hot or broken it should run. Hear in the Mojave Desert, highway or trail never worried about over temp condition. I note... any sludge up, plugged, rusted, busted...

If all of the cooling system is up to snuff... one shouldn't be overly concerned with an over temperature condition. If cooling system can not maintain the +/- 190 to 220 degree range with system cycling as need, time to look into problem. (my experience 6.2L, other engines /...