Question: I have a trailer camper it has a Dometic Rm 2652 Ameri. refrig.

If I remember right on those, the system works off 12 volt--120 volt-- or propane (LP gas). have you tried one of the other power source to run it off of?? If you get the same type cooling results the problem is probably a small leak in the freon system. Those use special internal gas. When I worked for GE the only way to fix them was to replace the complete cooling system which came pre-charged with the special internal gas. Quite expensive after the warranty. Now if you switch power source and one of the other sources make it work the problem will be with the type power you were using when it failed to cool properly. Many people that had system problems with those camper type refrigerators removed them and installed a small regular dorm style refrigerator that could only be run off a 120 volt power system. You would need a 12 volt to 120 converter to run it while on the road if thats what you want to do.