ac fan blower does not work on 2002 BMW 325i

My ac fan blower does not work but my dash shows the fan speed is on and act like is working. the ac sounds like is running when when I turn it on but I have no air coming out from the vents. can anybody help me?

Asked by for the 2002 BMW 325i
You need to have the Climate Control System scanned. BMWs are very complex. They have a rather large computer just to run the AC.