Stepan T Los Angeles , CA September 01, 2015 Appliance: Jenn-Air Refrigerator JFC2087HRS Jenn-Air Refrigerator Jfc2087hrs: Intermittent ice forming on evaporater. How to replace Refrigerator Defrost Thermostat. Replaced thermostat on evaporator. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours