Yeah, it will get the thermal switch soon. It was a tractor we bought with a 403 already in it that was ready to hook and has been a blast to pull. Never really thought about the fan as long as we were careful but missed it this time. Engine developed a knock in it last Fall and needs to be torn down anyway. I idiot proofed one of my other tractors a long time ago with the thermal switch, so it never crossed my mind. As Homer would say, "Doh!"