Many have had problems with frozen A/C units, there are basically only a few causes.
First: EVERY time save one I have seen freeze up it was caused by low coolant, This indicates a need for professional help or a new A/C.. That one time I'm not sure about.
Many on the forums claim that running the fan/blower on LOW will cause or at least contribute to freezup, you talk about closing vents to direct the cold air to the "Quiet end" of the RV, makes me think you are doing this, closing vents, by the way, also contributes (PS it is quieter if you run the other A/C and route the cold air to the sleeping end).
Dirty intake filters can contribute,, anything that reduces air flow.
Another cause several have found: on my A/Cs and many others there is a probe stuck in the evaporator (cold) coils near the bottom.. Some folks have found it lying in the drip tray instead of stuck in the coils, it is a frost sensor designed to shut down the compressor if icing starts to happen.. If it's not there, it can not work.
And in some HIGH HUMIDITY cases.. there is no cure or so I am told, However, This, I do not believe.. But that's what they say.
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Home is where I park it!
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