weird!! climate control

I just bought a car (90' cavalier) and realized that nothing comes out of the vents, no heat, no a/c no air at all. The blower/fan works cause i can hear it working but nothing comes out of the vents. I am so perplexed. Can anyone help?
Thanx

your cabin air filter could be clogged or one of the flaps that changes fresh/inside air, hot/cold, or the vent selector could be blocking off the passageway

a '90 Cav doesn't have a filter. but something is obstructed.