I have an '06 mazda6 with a problem with the fan. After turning the car off the electric fan runs for several minutes. It cycles from high to low speed. It does this every time the car is driven even in cool weather. The temp gauge never shows that the engine is running hot and this occurs even after a short drive. The car developed this issue a couple months ago and it is getting worse. Could this be a problem with the "fan controller"?