John, I'll leave this in Newmar as it's quite possibly a design issue, but it it more related to ventilation and air flow than Newmar I'd suspect...
With my refrigerator issue(s) I learned the fans in the ventilation shaft behind the refrigerator were not working, which seriously hinders the ability of the refrigerator to cool or freeze at an acceptable temperature.
Realizing the refrigerator itself makes noise, try and open either the lower or upper side vent (if applicable) and listen to hear the fans running...
My issue was a bad thermal disc which is mounted at the end of the fan wires and directly on the condenser fin in the space behind the refrigerator. Once this $2 part was replaced the fans ran wild and kept the fridge/freezer COLD...
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2019 Grand Design Solitude 380FL fifth wheel
2017 40' Renegade Verona LE LTS (traded)
2018 F150 King Ranch Crew Cab Diesel
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