Where is the blend door actuator located?

Hello, if you have a multi zone system where you can set the temperatures different from the passenger side and the driver's side then there is an air mix door for each side. I'll post some service information on this, and if you have an enhanced scan tool that can do full system scans of all the modules in the vehicle, you will most likely find there is a code stored in the HVAC module for one of the air doors not responding or some other trouble about a fault happening in that system, but you should be able to access the driver side (LH Air mix door) actuator with these diagrams I'll post, I find these actuators just strip off some of the little plastic teeth on the plastic gears inside and you will sometimes hear a clicking noise when it's trying to move that specific door. Unless there's a circuit problem with the actuator. But I'll post some info and you can check it.

So sorry for the delay. Diagrams 1, 2 are for a manual A/C system, you'll need to remove the glovebox to get to the air mix door actuator on the passenger side, and there are some testing procedures listed here for checking the actuator, you should be able to put your hand on the actuator and when charging the controls from hot to cold and back, you should feel the actuator moving the air mix door, if you don't hear or feel it doing anything, then you can run through the testing section and check it for power with the key on engine off.
I'll post a wiring diagram next, so you know which wires to check first.

This is the Manual A/C operations and wiring diagrams, the Purple wire is the power wire for the actuator and there looks to be 4 other wires for certain positions, it's a bit odd for a system with only one air mix door to have hot air on one vent and cold air on another, which is why is sounded like a 2 air door system, if you find the diagrams don't match, then we can put up the 2 air mix door info, in that case the LH (driver side) system has an air mix door on the driver's side lower dash when looking right and up from the gas pedal area, I would more suspect that door having some sort of issue with such high temperature differences per side. The last 3 diagrams are the components listed for the manual A/C system.

But if you can have someone with a capable scan tool scan the entire vehicle (every module) for trouble codes you will most likely find a code(s) stored in other modules which could help shortcut this diagnosis. Even if a shop were to just do the full system scan and write down all the codes present for you, that could help, the HVAC control module might have a code already stored in it for whatever is at fault here.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

I know I'm sorry these diagrams are not too clear on when direction it's looking from. Let me see if I can find some better info for you here. So even with the A/C off, just the blower motor on and air moving through the vents, when changing the temperature from hot to cold and back you should see and hear an Air Mix door motor moving, the manual A/C system shows the air mix door on the passenger side, so keep the A/C off for now, so we're just dealing with the air mix door moving and not any other doors that might move with the A/C on, such as any Recirculation door or Mode door. See if you still get movement by the actuator on the driver's side actuator with just moving from Hot to Cold and back.

Are there any flashing indicators on the control panel for the heater when its on, or when changing temperatures?

For the manual A/C system service info here is putting the air mix door on the left side (drivers' side) but in the wiring diagrams it's putting it on the right side, hence the confusion here.
Does the actuator you see moving have a 5-wire plug with these wire colors? That way you can identify the air mix door from the mode door as in the wiring diagram below. The purple wire is the power feed for both of those doors, but to identify which is which, go by wire colors.

Are you able to change the air flow from the dash vents to the floor and windshield etc? Or is it stuck in one position? The movement you saw with the A/C on might be other doors and not necessarily the air mix door. And changing temperatures you still have just cold on the passenger side and warm on the driver's side?

The air mix door actuator is listed as being on the RH side, so the passenger side. This picture is not sideways or anything, correct? The two wire component you're seeing here is going to be a temperature sensor, the actuator is going to have 5 wires, look for the purple wire. It looks like there is a connector wrapped in electrical tape right there with an orange piece sticking out of the tape. These actuators look to have a linkage bar on them, so if you follow that back it will go to the motor that moves the bar and in turn, the air doors.

The white lever in the middle of the picture is one of the doors, and the actuator is at the end of the rod that moves the door arm.

So this is right side up? =)