Gail T Williamson , NY June 13, 2021 Appliance: Whirlpool Refrigerator WRF560SMYW04 Frost/ice buildup in freezer causing fan to run constantly and loudly. Replaced defrost heater and temperature sensor. Read More... 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Nut Drivers, Screwdrivers, Socket Set