Patricia M Apache Junction , AZ July 18, 2014 Appliance: Whirlpool Refrigerator ET21CKXHW01 Whirlpool Refrigerator Et21ckxhw01: Refrigerator not cooling but freezer working. How to replace Defrost Heater. I ordered the heating element by phone and when I promptly recieved the part I watched the installation video provided on the website and easily changed out the part. My refrigerator is over 10 years old but I am currently buying a home which will have a refrigerator in it so buying a new one at this time was not needed. Being able to purchase the part at a reasonable price and do the repair myself was great! 10 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes