Refrigerator Bimetal Defrost Thermostat W10225581 is located inside the freezer compartment either directly mounted to the evaporator or indirectly mounted to the evaporator.
The replacement part of Defrost bi-metal thermostat WPW10225581 is to clip onto the evaporator and protect the evaporator from overheating during the defrost cycle.If your refrigerator does not defrost properly you can test both the thermostat and the heater to figure out which part is at fault.For this repair,you will need a Phillips screwdriver,a 1/4 inch nut driver,a flat blade screwdriver,a pair of wire strippers,a roll of electrical tape,and a few butt splice connectors.

Defrost Thermostat WPW10225581 Fits The Following Model and not limited to:
For Whirlpool: 3ED25DQXBW01,3ED25DQXDN00,3ED25DQXDW00,3ED27DQXAN00,3ED27DQXAN01,etc...
For KitchenAid:4KSRS22QDW00,4KSRS22QDW01,4KSRS22QFA00, 4KSRS22QFA01,4KSRS22QFA02,etc...
For Kenmore:10632842010:10632852010:10632852011,10632853010,10632853011,etc...

fixes the symptoms:The fridge is too warm or cold ,Freezer section too warm or too cold,Freezer not defrosting,Too much frost buildup,Fridge runs too long.