Center air vents not blowing air. Side vents work.
 

I have a 2000 S70 AWD. The center vents in my car do not blow heat or cold air. When the heat is on I can feel cold air coming through them, but just barely. The side vents, however, work just fine. Is there a blower that is bad? Also, how can I fix this myself. Thanks in advance for your help.

You sure you got your center vents open?

Yes, I am sure the vents are open. Any other suggestions?

Whenever the car's windshield defroster is on, the centre vents don't usually work. Where is the dial positioned in your car?

Sounds like motor is burnt that opens and closes flaps.