To manually defrost my side-by-side, you have to remove three screws to pull off an aluminum duct cover at the rear of the freezer cabinet to get to the frosted over internal coil. With the cover on, everything looks fine in the freezer, and frozen things remain frozen. My "too warm" symptom shows up in the refrigerator portion of the cabinet, where the fan in the freezer section pushes the air to keep the refrigerator cold. Cold air from the freezer compartment goes in the top of the fridge cabinet, filters down through the contents, and returns to the freezer compartment at the bottom to begin the cycle again. When the coil in the freezer ices over, the fan in the freezer above the coil cannot draw air over the coil to force cold air into the fridge section to keep it cold. The fridge section gets too warm, the freezer remains plenty cold, and the compressor runs continuously trying to compensate to adequately cool the temperature sensor in the fridge compartment.
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