no heat blowing what's the problem

I have a pontiac 1994 and I have heat and air and none of them blow anything out of the vents. What is the problem. Any feedback will be greatly appreciated. thanks

Are you saying no air is moving as in the blower motor isn't circulating any air at any position, or it just can't be switched to the vent setting but blows air through the defroster and floor vents?

I have nothing in any vents including defrost and what not. I have heard it is probably a blower switch or the blower. but I am not sure. and is there a way to test it?

you can jumper the blower motor to see if it works. If it works with direct 12v applied, they I'd say it's in the blower resistor or switch. If it still doesn't blow, then it's time for a blower motor.