Where is the mode door actuator?

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.