Hi,
The mode door is located under the dash on the HVAC box. See pic 1 below.
It sounds like you are on the right track with the mode door. First, take a look through this link:
https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position
If you look at the remaining pics, I provided the directions and pics specific to your vehicle for replacing the mode door actuator.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pics below.
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Tuesday, April 13th, 2021 AT 8:34 PM