The HVAC temperature will not switch from hot to cold and back why?

Truck blows hot air no matter what setting it is on. The system is full of Freon. Compressor goes on and off along with the condenser cooling fans operating normally. I've noticed the high pressure side where the orifice tube is located icing over going in towards the firewall. Also, before the start of all this, there was a popping noise coming from under the dash towards the floor board on the passenger side. I've also noticed that once the popping stopped, that is when it started blowing hot. The blend door seems to be operating correctly, but not exactly sure where the temp control actuator is located on this particular model. Any help on this would be much appreciated. Thanks!

Is Fig. 2 for a dual climate control and Fig. 3 for a single? Just want to make sure im reading this right because I have a single control unit and not a dual.

I have discovered that the heat/cool blend actuator is not always working and that I may need to replace it but I do not know where it is located, when I took the (3) 7 mm screws from under the dash near the floor, then removed the cover I did not see any actuators just more plastic, so before I start pull the whole thing apart or paying some crazy amount of money I was wondering if you knew where it is located or even have the exact diagram for my truck? Thanks.

The driver side vents would flip from AC to very hot air. I watched the video and replaced the blend door actuator. Did the re-calibration by disconnecting the battery for about fifteen minutes, reconnect and turn the truck on for one minute. Turn off a few minutes and turn on again two minutes. I could hear a ratchet sound during the process. Now it is hot all the time and very little air volume coming from the passenger side vents. What can I do to fix this? Thanks.

Looking at your diagrams, it appears I replaced the wrong actuator. The one I replace is shown in your photo below under the cowl on the passenger side. Is the correct one under the top of the dash? Do you have a video showing how to get to it?

Now I am confused. According to what I have read, the actuator on the left over the gas pedal is the mode door. Most of the videos I have seen state that the hot/cold on the driver side is regulated by the actuator on the right side underneath, the one I replaced. I even think the 2CarPros video stated or implied that. But the diagram on the 2CarPros article suggested that the driver side hot/cold was the actuator on the top right side (not the recirculate). So I am thinking that I did replace the correct actuator, but that either my replacement part is not correct or I did the re-calibration wrong.
I opened the actuator that I took out. It did not have the metal under the large gear, nor the track on the board like all the ones in the videos have. I do not know what that could mean. Outside, the actuators look the same.

I installed the actuator and did the calibration. The air was coming out hot but not as hot as sometimes which means that the door was in the half open position just the way the actuator was installed.
I looked at the plug and found two rows of contact holes. The bottom row has the metal contacts. My plug is going into the top row (based on how close the pins are to the edge of the housing). There appears to be some metal in the top row. Will it work to plug it into either row?

I watched you video on replacing the blend door actuator. I successfully removed the old, and installed the new. It was still blowing hot, out of the driver's side. It seems like the actuator is being told, to turn the shaft, to heat. I removed the new one, and tried seeing if the actuator would move, when adjusting temp. Kind of at my wits end, on this one. Any advice, would be appreciated.

After I wrote above I looked at my old actuator. Its pin placement is identical to the new one. I can only assume that there are contacts in both holes. The 2 / 3 pin lineup is correct. And, as you said, the plug only goes in one way.

I have the manual temp control and I know my actuators do not work. I have replaced the actuator located at the bottom over the transmission tunnel. It moves with the temperature control. I still cannot move the air off the defrost and don't think I get recirculating air. So, here is my question. Per your diagrams, it looks like there are a total of four actuators. When I look for the part, I find it confusing to find the correct part number for each actuator even though I have the RPO codes. I installed Dorman 604-112 and it works great. Is it possible that this same actuator will work in all four spots?

I appreciate you providing some light on this topic for me. Donation sent! Thanks.