Rory L Leland , NC November 21, 2017 Appliance: Amana Refrigerator ARB8057CSL Amana Refrigerator Arb8057csl / Parb8057cs1: Refrigerator would not defrost. How to replace Refrigerator Defrost Thermostat. Replaced Defrost Thermostat. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes