It is probably freezing up internally. Most roof units have a freeze (temperature) sensor to detect that and automatically turn the compressor off while maintaining air flow (fan). When the freeze condition clears, it goes back to cooling again. A freeze up can be caused by already chilled air getting sucked back in the intake (a ducting problem), or by low refrigerant in the compressor or other internal problem.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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