Good morning,
This sounds like the mode door actuator is the issue. It is difficult to access.
https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position
I attached the procedure for you below with pictures.
You can get the part at any parts store.
Let me know if you have any other questions.
Roy
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Friday, December 24th, 2021 AT 9:46 AM