Hello,
Looking at the information Danny provided, it appears the temperature door actuator is located on the TOP side of the HVAC plenum on the right side of the vehicle. Unfortunately the service manual indicates the dash must be removed to access it for replacement purposes. However, I would follow the diagnostic procedure listed below before removing the dash. This may save you some headache in the event the actuator isn't really the issue.
You should be able to get to the actuator connector without too much disassembly. The only other component you'll need to remove the is heater control panel. I've also included a copy of the wiring diagram referenced in the procedure. If you're not familiar with how to use a DVOM (Digital Volt Ohm Meter), I've also provided a link to a simple how-to tutorial.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
1. Turn ignition on. Using DVOM, backprobe terminal "B" (Light Blue wire) of heater control module connector C2 to ground. Move temperature control knob from HOT setting to COLD setting, and then from cold setting to hot setting. If voltage varies between approximately 1-12 volts, go to step 3).
2. If voltage does not vary as indicated, check for poor connection at heater control module connector C2 (terminal "B") or short to ground/voltage in Light Blue wire. Also check for open Brown wire between heater control module connector C2 and fuse block. If connection and wires are okay, replace heater control module.
3. Using DVOM, backprobe temperature door motor terminal No. 10 (Brown wire) to ground. If battery voltage exists, go to next step. If voltage does not exist, repair open Brown wire between temperature door motor and fuse block.
4. Using DVOM, backprobe between temperature door motor terminal No. 7 (Black/White wire) and terminal No. 10 (Brown wire). If battery voltage exists, go to next step. If voltage does not exist, repair open Black/White wire.
5. Using DVOM, backprobe temperature door motor terminal No. 8 (Light Blue wire) to ground while moving temperature control knob. If voltage does not vary between approximately 1-12 volts, repair open Light Blue wire. If voltage varies between 1-12 volts, check for binding door or poor connections at temperature door motor. If okay, replace temperature door motor.
Image (Click to make bigger)
Sunday, September 15th, 2019 AT 8:45 PM