Johnny B South Riding , VA December 13, 2016 Appliance: Whirlpool 30" Built-In Electric Double Oven Self-Clean Upper And Lower Ovens RBD306PDB14 Whirlpool Oven Rbd306pdb14: Fan for bottom oven was making a ticking noise. How to replace Cooling Blower Kit. I replaced the bottom fan and while I had the double oven pulled out of the cabinet, changed out the fan in the top tray as well. It was a straight forward easy repair. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes