How can i get my air condtioner and heater to blow air through the vents? on 2000 BMW 528i

when i turn on my air conditioner or heater, no air is blowing through the vents. I turn the blower all the way to high and i can barely fill the cool or warm air flow through the vents.

Asked by for the 2000 BMW 528i
poss direction issue, is the air blowing always thru the defroster?