This sounds like one or two problems. The first is probably the air mix door actuator. If you remove the glove box insert..looking through the hole in the support to the right.you will see the arm. Change the controls and watch the arm for movement. Most likely it will look a bit jerky and problematic. That is a broken gear inside and the actuator will need to be replaced.
If the air isn't being directed where you instruct it to..that is typically collapsed nipples at the HVAC programmer. There are a few threads about this lately. Let me go dig up the link to the fix with vacuum hosing.
Here'* the link to that fix.