Start car, turn off anything making noise. Set driver side and passenger side to cold. Next, side driver side to warm and listen for a "motor" sound from u Der the dash. Do the same for passenger side. If you hear the motors, those are the actuators and they are working. In this case, the retaining clip has failed and needs replacing. If you don't hear the motor, the actuator needs replacing. You should hear a motor on either side since both failing would be rare.
Retaining clips are around $3, actuators can cost up to $100. Replace from under dash, don't remove dash as some suggest as it is a waste of time.
Sounds like the heater blend door. The actuator may be stuck or broken. The actuator opens and closes to adjust for the heat setting in the car. You might be able to take a coathanger and manually open the door if you can get to the control arm. They are usually hard to get to and pretty expensive. It is located under the dash at the heater core box. Good luck.
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