Electric fan wiring??????

I agree with both and Cracked and Red on this one. Sitting by the side of the road wishing you could get one fan to run might change your mind. Relays are just not that expensive, neither are fuse holder/ breakers.

Even if the stat switch fails, and even if you have no separate manual switch, you can usually easily bypass the stat switch, to limp home.

One bad fuse/ relay/ motor kills the whole deal.