My evaporator looks just like yours. I have a 2019 Dutch Star on a Spartan chassis. When I emailed Evans Tempcon which is now ProAir, LLC. I was told that Evans Tempcon installed the evaporator thermostat sensor in the wrong location. It was not installed in the coldest location in order to sense a freezing condition. The cure was to move the evaporator temp. sensor to a new location. I will be getting mine relocated under warranty in the next month. Mine iced over and when I stopped (fresh vents open) driving the water was dripping everywhere as the ice melted off the evaporator coil.
You might want to go to the ProAir webpage and send them a note for more details on the proper location for the evaporator thermostat bulb location.
My Evaporator...
