If the system runs you will first need to add freon to the system (make sure it the right freon) Just enough to find leak. After you find leak and repair evacuate the entire system and weigh in charge. Hope this helps.
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It's R-22 and you need to be licensed to handle it, if you're not a A/C service technician or fimiliar with charging an A/C system, then it is best to have a Coleman Service Technician to charge it for you.
I don't think you need a new one just a good cleaning and service. The unit has a liquid high temperature line near the compressor with a fan blowing outside air across it this coil gets clogged over time with air-borne dirt and pollen and leaves and such and must be cleaned regularly or the unit will be unable to remove the heat from the coil and during the peak demand (3pm) the circuits that protect the compressor and the trailer wiring from being overloaded and burning or melting will trip. From what you have described it sounds like the RV is working as it should with a condenser coil that needs to be cleaned. GL and happy camping! P.S. I've only serviced the occasional RV unit but in those cases I laid a piece of plywood on top of the Rv for work platform removed the retaining screws from the top cover and used a spray bottle with a good heavy foaming cleaner a shop-vac and a brush to get the job done.