Caleb D Elkton , VA September 11, 2022 Appliance: Whirlpool Refrigerator WRF736SDAB12 Whirlpool Refrigerator Wrf736sdab12: The evaporator was freezing up/ not defrosting. How to replace Grille. Replaced Evaporator Fan Motor along with Defrost Thermostat and the Thermistor. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes