Gerardo P Forney , TX March 12, 2023 Appliance: Whirlpool Refrigerator WRF736SDAM13 Whirlpool Refrigerator Wrf736sdam13: Ice build up in the freezer. How to replace Refrigerator Condenser Cleaning Brush. I replaced the evaporator fan motor and the defrost heater. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes