[C McGaw]

I have a Kenmore side by side refrigerator Model No. 3639532783. I was told I need to replace a Defrost Control to correct frost problem on coils. Can you let me know where the "Defrost Control" is located at?

[woodchuck]

If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat


Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com

Your timer should be just under the door behind the removable kick plate. Here is a link to a picture and some descriptions of installing it.
Partselect.com - GE Refrigerator Parts And All Brands of Appliance Parts