About a week ago, I tried to turn on the fan/air in my car and nothing happened. No noise, no air…nothing. Then a few days later, the air came back and was working perfectly (airconditioning, fan, heat, all of it). Then a couple of days later, everything went off again and has yet to come back for the past few days. Does anyone have any idea what’s wrong with this thing? I think it’s possessed. 
No, not possessed, there’s a family of trolls living inside.
I’ve seen blower motors to fail in this way when the brushes wear out. Of course, it could be something else…
Turn the ignition switch on so the dash lights come on and turn the blower speed to high. Under the passenger side of the dash locate the blower. With the handle of a screwdriver rap on the blower motor. If the blower starts working replace the blower motor.
Tester