Philip O Shorewood , IL July 11, 2016 Appliance: Whirlpool Refrigerator GX2FHDXVA03 Whirlpool Refrigerator Gx2fhdxva03: Ice build up that blocked air flow to the refrigerator. How to replace Bimetal Defrost Thermostat. Installed a bimeti-def switch 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes