I have researched for weeks and cannot fix the issue. I have a 2011 cayenne s and the heat/ac would not blow any air one day. Then it just started working again by the time I parked it. And now it's completely not working. I've changed all the fuses, and tried two brand new blower motors. Still nothing. When I turn it on full blast no air comes through at all. I also wired a straight ground to the motor to rule out a ground issue. I can hear a slight clicking in the engine compartment as if the ac unit is attempting to engage but stops. I wouldn't think that would cause the car not to blow any air. I'm out of ideas. Anyone got anything else?