The resistor pack is a module for a set of series resitors that BMW uses in several older models and the diagnosis for failure was the fan would only blow on the highest setting. The E90 blower has a "motor contoller", P/N 64119222072, that retail is $115, or $92 at Tischer BMW. The blower motor is closer to $180 retail.
Temperature control is by left and right hot engine coolant radiators, after the one AC evaporator, each with its outlet thermometer (that you can see just inside the left and right center grilles). MAX shuts all the flappers except those that blow in your face, sets blower speed to maximum, and thermostat to 60°F.
I have a 1999 BMW 323i which the ac was working perfectly fine. My instrument panel for the ac/heater blipped and went black, which shut down my ac. Now nothing turns on, defroster, ac, heater, fan speed, temperature control; nothing lights up. I checked the fuses and they are all fine.
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bmw e90 heater fan not working
