It seem like most people dont understand this vent issue. I have the same problem with the air hardly coming out the vents even at high speeds. Yes my fan speed selector sw and a/c compressor does work! I was told by a bmw mechanic that it is either the A/C control head unit or the vent electronic control module (Blk with 3 connectors) located behind the main control unit. It regulates the opening and closing of your vent dampers. I will be replacing the control unit first because it sends the signal to the module. Hope my post point someone in the right direction.
BEST TO LET BMW DEALERSHIP REPLACE HEATER BLOWER IF NOT MISTAKEN YOU HAVE TO DISCHARGE AC SYSTEM TO REMOVE REFRIGERANT LINES TO REMOVE BLOWER MOTOR COVER.THIS IS NOT HOME FIX.BMW CARS NOT EASY TO WORK ON.YOU HAVE TO BE BMW MECHANIC TO WORK ON THEM.
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