Question about 1993 BMW 3 Series

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Low airflow through vents

My BMW 318i has low airflow through the vents whether it is AC or heat. I replaced the blower motor a year a go. The system sounds like it is pumping out alot of air, but in acual there is minimal air flow coming out any of the vents even on the highest setting.

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  • don abraham
    don abraham May 27, 2014

    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

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Probably the vent in front of the blower motor lose, check that first.

Posted on Jul 27, 2008

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