I've got my dual fans run through an on/off toggle that triggers a 40 amp relay, and a gutted thermostat. I usually just flip it on after the engine's started. I was worried that I might forget to flip it, but it's just automatic now. I've consciously thought "did I flick the switch on?" and every time I've checked, they're already on and going. If, for some reason, I want it to get warmer, I can just turn them off for a while, but it's been over 90 degrees here for almost a month straight, and that hasn't come up yet. Car runs nice and cool no matter what the temp or driving situation. I was stuck in traffic the other day for over an hour idling and it was 95 degrees, and the car never got over 140.