My dometic air conditioner will turn on and cool air comes out but shuts down within five minutes
Need to determine if it shuts off on satisfied thermostat, high pressure, low pressure, overload, etc. and inspection of condition and behavior of the system is needed for proper diagnosis. What exactly shuts off, air flow, cooling? does it turn back on and then off, as in short cycling? Make sure there is air flow thru the outdoor coil (radiator) and indoor coil for now. give a visual inspection to those coils making sure they are not obstructed or clogged, impeding air flow thru them and that the fans run. Only then can a technician diagnose the charge and performance of the unit.
One can say it has a bad fan motor, there are at least two in the system, or that there is no air flow thru the radiators, condensor and evaporator, or that supply air flows directly on to the thermostat and thermostat satisfied on temperature, or, or.... who would do the servicing? when was the last maintenance/inspection on the system?