I have this whirlpool wrf767sdem01 with bottom freezer at -1, the fridge part hovers from 39-43degrees. The coil fan cycles and blows good. Do these have the thermosistor like samsung? To me it seems with the fan cycling that maybe it's a bad temp sensor. It doesn't appear restricted or frozen up. I haven't pulled the the fridge coil cover yet. Thanks for any input.