Thermistor
Rita, that slider thing is called a thermistor -- your service person should be able to give you some advice. Or just google the term, along with the brand of fridge you are using. But be aware that the change takes a long time -- hours, not minutes. We experimented with the trailer in the driveway -- put the thermistor in a certain position, put a glass of water in the fridge, and then waited all day for the temp to stabilize. An instant read thermometer can be very helpful. Good luck, and let us know how it goes!
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