ok so my little radiator fan was on all the time so yesterday we replaced the whole fan unit. We let the car warm up to 90 degrees (normal running temperature) and neither fans came on. I took it for a drive down the motorway to warm it up abit got back and neither fans came on but the temperature did not rise above 90 degrees. So i put the aircon on and again neither fans came on so i dont know whats going on. When do other peoples fans come on ect any help would be great.