<--------- In this I have a 180 stat and a 180 sensor in the water pump. I also have a 3-way switch (on,off,auto). When the water temp gets to about 185 the fans (have 2 small fans) come on. I always leave the switch on auto so that I don't forget to turn it on. After the engine is shut off the fans will run for about 4 or 5 minutes. Don't ask me about the wiring because I did'nt do it.