Yup, mine won't come on either. Not when the water temp reaches 220. Not when I turn the AC on. Cooling system works fine at speed and holds at 200 but when I stop it creeps up. Fuse was the first check, its fine. I was about to bend over the barrel and just buy the whole assembly for like $300 but I'm glad I didn't. I hope anyway. I just went out to the garage and took the fan assembly all the way out (not as bad as I was expecting by the way). Now I just read another post just a few down that got very technical and honestly, I was completely lost. So me not being very technical and all did what I thought was a good test and just ran wires straight from the battery to the terminal on the fan. The fan spun right up. I checked both before and after the controller box attached to the assembly and in both situations the fan spun up no problem at all. So now what? It appears my fan assembly is fine and the fuse is fine. I'm hoping someone smarter than I can shed some light on what the problem might be. Also as a last resort to make the car drivable for summer, is it completely unacceptable to completely ghetto rig it? Perhaps run some wires from the battery through a 15 amp fuse and to a switch I put in the cabin and just turn the fan on manually as necessary.