Please see the attached document below. It shows the 3 actuators and the mode door is on the top. The blend doors (assuming you have dual zone) are below those. If the temperature won't change either then you have an issue with those as well. So you may just want to change them all. Please see the attachments on my previous post for more detail on this.
Image (Click to make bigger)
Saturday, December 12th, 2020 AT 4:42 PM