I have a 2004 sunfire, the problem that I am having is that there is no blower speeds, there is a little bit of heat that comes out when the car is at normal operating temperature, but the blower doesn't turn on at all, the rear defrost works, and all of the fuses are good, I was read that it might be the speed switch or blower motor, does this sound right, also the heat resistor is out of a 2000, would this affect anything, i am thinking not because the wiring is all the same. Any help would be great thanks