Michael F Memphis , TN November 05, 2015 Appliance: Whirlpool Refrigerator ET1FHMXMQ01 Whirlpool Refrigerator Et1fhmxmq01: Refrigerator was not cooling enough. How to replace Refrigerator Defrost Timer. Replaced defrost timer. I know it was bad because of a grinding I was hearing from it. Temperature still varies too much. It goes from 35 to 60 degrees. I have a replacement thermostat I am also going to replace and see if that helps. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes