Hi,
Chances are the blend air door isn't working in the vehicle. The blend door actuator is what moved the door to determine what temp the air is entering the vehicle.
If you look at pic 1 below, I highlighted the actuator I'm referring to. What I suggest is to remove it and while it's still connected to power, see if it moves when you change from heat to cool.
If it doesn't, here is a link that explains in general how one is replaced. Note: This is under the dash on the driver's side of the vehicle.
https://www.2carpros.com/articles/replace-blend-door-motor
The remaining pics below are for the removal and replacement specific to your vehicle.
I hope this helps. Let me know if you have other questions and what you find.
Take care,
Joe
See pics below.
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Sunday, June 20th, 2021 AT 9:44 PM