Problem with air not coming out of vents.

i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

the vent controls are electric. there are three (all under the dash) the one that controls defroster to vents is located in the middle of the dash close to the floor

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

Hey man if the blower is working and air is coming from your other vents i have a few ideas.First i would start by checking your vent selection switch something may be stuck where the dash vents open. If the selector is fine you should try checking the ducting behind the dash it could have come apart or simply be cloged where it routes air to your dash. hope that is helpfull.

Almost sounds like the actuators are inop. depending on which style you have, some are electrical motors and some are vacuum. These control the mode doors which move to deflect air to various vents.

There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Check for vacuum hose leak.

Hope I was avle to help, glad you up and going.

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Try replacing the cabin air filter.

SOUNDS AS THOUGH YOU HAVE A BLEND DOOR STUCK CLOSED IN YOU HEATER / AC SYSTEM SOMEWHERE. CHECK THE VACUUM MOTORS THAT OPERATE YOUR BLEND DOORS ON THE SYSTEM.