The defrost control in your refrigerator acts like a clock. It continually advances and alternates between activating the cooling cycle and the defrost heater, keeping your refrigerator at the appropriate temperature. If you notice that your refrigerator seems too warm or too cool, you may need to replace the defrost control. This part is...Read more made of white plastic and contains 4 metal prongs that connect to your refrigerator. This part is sold individually. The defrost control is located at the back of your refrigerator, inside the control housing. To access this part, you will need to unhinge your light cover, and disconnect the air inlet assembly from the control housing.