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How to Troubleshoot and Fix a Coleman-Mach RV Air Conditioner If your Coleman-Mach RV air conditioner isn't cooling like it used to—or worse, not turning on at all—don’t panic. Many common issues can be diagnosed and fixed without a trip to the service center. In this DIY guide, we’ll walk you through how to troubleshoot and repair a Coleman-Mach AC unit, step by step. ? C …