I have a 1994 325I with a very strange problem. The heater/AC fan control will work fine on all speeds and then after I turn the car off it doesn't work at all. It is like there is no power to the system. Now things get strange. With the ignition on and the fan control set to run, I shut the passenger-side front door hard and the fan motor begins to work. I have checked the resistor pack, the blower motor, the control switch and all conections. Is there something I am missing?