Cliford G Wrenshall , MN July 24, 2018 Appliance: Whirlpool Refrigerator GX5FHDXVA00 Whirlpool Refrigerator Gx5fhdxva00: Freezer cold refrigerator wam. How to replace Refrigerator Defrost Thermostat. Replaced the control board & defrost thermostat after watching video on AppliancePartsPros.com. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes