Brian D Hazlet , NJ July 13, 2021 Appliance: General Electric Electric Wall Oven JK5500DF2BB Ge Wall Oven Jk5500df2bb: F97 lower cooling fan. How to replace Cooling Fan Lower. Replaced the lower cooling fan and while I was at it replaced the upper cooling fan. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours