I plugged the motorhome into shore power. Naturally of course the A/C unit is not putting out cold air. The rear one won't even come on. Even though the switches are set to front so that they both...
if the compressor on the rear air is shot then you will have to replace the unit more than likely. If you have craigslist there check under rv section. In my area there are a fewnew a/c units there cheaper priced.