i have a kenmore model 106.70842100 with a very similar problem everthing is cold for a few days then cooling stops . if i turn the cold control knob down then back up it will kick on for a few more days. im guessing its a thermostat problem but whats the difference between a bimetal or thermostat ? there seem to be 2 parts listed under thermostat so which is it ? part number please?