No air coming from vents in 02 buick lesabre

try turning the fan deflector knob from defroster to full dash vents. If that doesn't free it up do it a couple of times and if that still doesn't free it up, then you possibly have a faulty actuator to the deflector. Try putting the fan setting on the lowest possible to limit the amount of back pressure to the deflector. The only other thing I could suggest is to check the internet and see if your vehicle has a cabin air filter, depending on how old the car is and the conditions of where you park it regularly, that may be plugged up. Hope this helps...d