My side by side Kenmore 253 51693105 stopped cooling in the refrigerator. I figured the evaporator was freezing up. Got that right. Defrost timer suspected as problem. I removed the timer and re installed it because I didn't see anything obviously wrong such as wiring or other visible issues. I let it run on the high settings overnight and the fridge dropped to 45 but no lower. I have a digital to ck temp. Could th defrost still be faulty and maybe causing the cycling problem?
When that happened to mine, it was the defrost thermostat that was bad. Simple fix, and inexpensive part, but I had to remove all of the shelves. And the panel at the back of the freezer compartment (inside the freezer). Go to repairclinic.com put in your model #. They have videos on how to diagnose the problem, and how to make the repair.