Have a 2003 36' Gulfstream Ultra Supreme. Never had issues with A/C's b4 & don't know anything about them? I do have an issue with the front unit now.Unit works as intended when controlled by thermost...
Sounds like the compressor relay is welded closed on the upper circuit board. You should shut the breaker to it, as it will run the compressor and cycle on the overload as it overheats.