Bruno S Medfield , MA February 07, 2020 Appliance: Bosch Wall Oven HBL5351UC/03 Bosch Wall Oven Hbl5351uc/03: Noisy cooling fan unit overheating.. How to replace Oven Cooling Fan Assembly With Fan Blade. Replaced cooling fan 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours