Anyone know whats wrong with my AC fan in my escort?

What is your question?

When I turn on the AC it goes a little from the vents by the windshield, but not out of the regular vents. It still feels cold when I put my hand over those "defroster vents" or whatever they are, so the AC still works. Just not the fan in the main vent. Also when I turn on the heater it blows nice and strong through the vents and gets hot quickly. I have no idea why the heater would go but not the AC. Any ideas?