The defrost fan is stuck on and constantly blowing hot air onto my windshield and heats up my car quickly. I always have my a/c, fan and everything turned off at the a/c buttons inside the car. How do i get this fan to turn off? Or is it supposed to be on, I know it didnt used to always be on.

 

I'm not sure exactly how these ssytems are wired up, never had one apart, but a lot of cars have blower regualtors that can short or go bad. I guess it could be a problem in the switch itself. But deffinately ck if there is a regulator.