I have a 2002 Maxima GLE. I replaced my radiator with an aftermarket radiator. Now I noticed that the cooling fans come on after a couple of minuets of driving. They come on even when the engine is running cool. We are having 30 degree weather but they still come on and won't shut off automatically. Normally after a long drive they come on and then will cut off after the engine temp is cooled down, but now they come on and stay on. I changed the # 1 and 3 relay. I changed the temp sensor. New thermostat. Flushed the radiator. Any Ideas.