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058966-000 Viking Refrigerator Defrost Thermostat – Fix Your Refrigerator That's Frosting Up or Not Cooling
The critical fix for a Viking refrigerator that's frosting up, not cooling properly, or has ice buildup on the back wall of the freezer. The defrost thermostat monitors evaporator coil temperature and signals the defrost heater to turn on and melt frost accumulation. When it fails, the defrost cycle won't activate — causing ice to build up on the evaporator coils, blocking airflow, and preventing proper cooling. If your refrigerator section is warm but the freezer is cold, you see heavy frost or ice on the freezer back wall, the refrigerator runs constantly but doesn't cool, or you hear reduced airflow — a failed defrost thermostat is often the cause. This genuine OEM Viking part restores automatic defrost function and proper cooling performance. Fits Viking Professional and built-in refrigerator models. Direct-fit replacement with no modifications required. Moderate 30–45 minute DIY repair that saves your food and prevents compressor damage.
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