"So, now we will test out the a/c and see if it still ices up (as it had been doing). If it does, we will call a mobile repair guy. We gave it our best shot, and there is nothing more that we can do by ourselves."
The Evap coils "Dirty up" on the side you can easily see and clean by removing the ceiling cover and looking UP.. (Inside the RV)
There are several causes for Icing.
Not enough air flow over Evap is one (Dirty intake filters, Dirty Evap, Blower on LOW) Low refrigerant is another (Causes the evap to get too cold)
Many RV A/C units have a frost sensor. This is a "probe" that is SUPPOSED to be stuck into the Evap coils.. sometimes they forget to stick it and leave it in the drip tray.. The job of this sensor is to shut down the compressor when it starts to Ice up.
I've had people who claimed to be A/C service folk tell me they have never seen low refrigerant cause icing.. I've seen it several times (Though I'll admit not in an RV unit) from Window units to industrial units I've seen it.
NOTE: Fixing that ... Well I know how to do it but not sure I can get what I need.... Professional assistance suggested.
