Eric M Sugar Land , TX October 25, 2024 Appliance: Samsung Refrigerator RFG237AARS/XAA-0000 Samsung Refrigerator Rfg237aars/Xaa-0000 / : Freezer evaporator coil freezing up. How to replace Refrigerator Defrost Thermostat. Replaced defrost heater element and bimetal thermostat. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes