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Re: Marine A/C and refrigeration
Minne, you would need to find out how your refrig ssytem is set up. In theory the thermostat turns the compressor on/off, but there are probably also high/low pressure switches thta can turn the compressor off for safety, and possibly an overheat switch in the compressor as well, i.e. multiple safety devices can shut the compressor, so the "switch" may simply be doing what some other system is telling it to do.
If you know where all the safeties are, you can probably test each one with a DMM, but the real test will require you to check the gas pressure in the system and that's going to mean a gauge set, assuming there are ports in the system to simply hook up guages. (In some, you have to tap in ports.)
So there's a limited amount you can do, but you still may want to look for a refrigeration tech, who can deal with the gas side of things. Ain't rocket science, plenty of flowcharts to troubleshooting out there, just that the tools (gauges & gas & EPA license) are often an inconvenient expense.