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When an RV refrigerator stops cooling but everything else about it still works, the cooling unit itself is almost always the culprit. The Nordic 6618 is built as a direct replacement for the Norcold 2118, so it drops into the existing cabinet using the original mounting points.
Replacing just the cooling unit is typically far more affordable than a full refrigerator swap, and it lets you keep the interior, shelving, and door you already know fit your space.
Have your model and serial number handy before ordering to confirm compatibility, since Norcold updated cooling unit designs across production runs.