Whirlpool Genuine OEM W10864518 Refrigerator Ice Box Adapter and Fan Motor Kit.
Possible Repair Solution For:

Frost build up
Please Note: This is intended as a guideline only, as other items can cause the same symptoms.
 
This part works with the following brands: Whirlpool, Roper, Admiral, Maytag, Hardwick, Jenn-Air, Estate, Magic Chef, Crosley, Inglis, Norge, Modern Maid, Amana, Kenmore, KitchenAid, Caloric & Ikea.