Hi,
The blend door actuator is responsible for air temp entering the cab. What you described sounds like a problem with the mode door actuator.
The mode door actuator is responsible for airflow direction. Actually, on this vehicle, it is referred to as an air distribution motor. On your vehicle, it is located under the dash on the left side of the HVAC box, (see pic 1).
If you look at pic 2, it explains how it works. What I would suggest is to remove the motor and check to see if it responds when you select the vents. If it doesn't, there is a good chance it is faulty.
Are you able to switch between the floor and defrost?
Let me know.
Joe
See pics below.
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Thursday, July 27th, 2023 AT 10:14 PM