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If it's cable driven, the cable may have broke the plastic piece it's connected to behind the knob not allowing the turn knob to turn the blend doors through the cable. To find out you will need to take the center trim off and remove the climate control box" the one with all the knobs on it", and see if the cable is connected. Be careful pulling it out as the box will have to be twisted to get to where the cable is attached, very easy to break the plastic pieces as the have been introduced to heat over the last 17 years which degrades the plastic. Hope this helps. Also utube how to remove the climate control unit as this can be very helpful
Sounds like your Cable to the Mixing Doors came lose or Broke. If it is Electric, then put your hand down on the Motor and see if it is actuating the door. If the Motor is working and still does not divert the air, then you have an internal issue with the Heat Mixing Box....
Mode Door 1. a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2. a.When mode door 1 is set to divert air away from the vents and into the second stage of the system, door #2 chooses whether air goes to the defrost vents to the windshield or out through the floor vents in the passenger and driver's side footwells. Failure is indicated by an inability to choose between defrost and floor. b.This door turns out to be the most difficult to replace. In order to replace the door, the dash panel has to be removed. It's still better than the dealer fix because you don't have to evacuate the AC system, drain the radiator, and remove the plenum box. But it is more work than the other fixes. When this door breaks, it falls in the down position, blocking the floor vents and diverting all air through the defrost vents. From a safety standpoint, this is good since you'd most likely rather have a clear windshield than warm feet. We suspect that a large percentage of customers will just leave this door unrepaired. You will have heat through the dash vents and to the windshield, just nothing to the floor. It's inconvenient, but you'll have to make the determination if warm feet are worth the extra work to fix the door. An extra pair of socks is easier.
GM used an electronic air door actuator on many models to direct the heat and AC for defrost, floor, dash vents, etc. The actuator, which is a small stepper motor attached to a plastic paddle or fin, gets weak with age and use, and the paddle itself can bind or jam. The part is under/behind the dash, and in most cases involves removing the radio, climate control unit, and several plastic panels to access. Allow 3-4 hrs minimum if you have not replaced one before.
Most likely the vacuum. The (door) that switches the heat from floor, dash, defrost, isn't switching. The door could be stuck and even though it maybe trying switch, it can't from being stuck or in a bind.
what your hearing is the actuator/blendoor which is located under the dash near the housing(the bug black box)it is a actuator which transfers the air in different directions.Depends on the year model. For 97-02 the fix is fairly simple and HeaterTreater has a solution available. The system has a plastic interface between the actuator motor and metal blend door. The motor is located on the bottom of the heater box under the passenger side dash panel. You can remove the motor and examine the plastic connector that goes into the box and attaches to the blend door. The connector will pull off if you pull straight down with a pair of pliers.
Some times you can "reset" the computer for that by disconnecting the battery for 15 or 20 seconds then re-connecting it. If that doesn't work then the mode door motor assy might have stripped gears or broken gears. (they are plastic) If you are familiar with where the mode door motor assy is you can turn the knob to change the mode (i.e. defrost, panel, floor) and see if the motor is turning. If motor is turning and mode does not change then the plastic pieces have broke or stripped. Usually when there is a problem with the climate control system it will default to the defrost simply as a safety thing. So you will have defrost so you can see where you are going. Hope this helps you all out, good luck.