Feeling warmth at the back exterior bottom of a residential refrigerator is completely normal and expected, because that area houses the mechanical compartment containing the operating compressor motor and the condenser coils. During the refrigeration cycle, the compressor pressurizes and pumps refrigerant, generating heat that must be rejected into the surrounding room via the condenser coils and cooling fan. However, if the back exterior feels scorching hot and smells like hot insulation, it indicates dangerous overheating caused by thick dust buildup choking the condenser coils. You can troubleshoot heat sources easily by inspecting coil cleanliness. You can verify normal operation when standard operational warmth at the back is accompanied by clean coils, functional cooling cycles, and properly chilled interior food storage compartments.
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