I wired mine using a temp switch that i pulled from some 4cyl citation. It turns on every time but at 200 :shock: So i have to find one that turns on at 180. Most likely i will buy a adjustable one and be done with it. But those Intrepid fans kick *ss at low speed,i don't have the high speed hooked up probably if i decide to add A/C. I had to upgrade to 140CSI alternator along with the wires and battery to get everything up to par. I must say it "sounds" like a newer vehicle when the fans are kicked on 8)