I broke my fan in 4 feet of water
yikes. I was thinking about this too, so I will have a override switch in my cab to turn off the fan. I will have a 2nd temp sensor set at a "higher-than-normal-temp" that will go around my override switch incase I forget to turn it back on, and to turn on the 2nd fan if the engine is generating more heat then the one puller can handle, as I plan to have 1 pusher and 1 puller, with the pusher being the backup or severe use fan.