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To clarify - are you referring to a temperature sensor - a small ( usually white ) part with two wires ?
If that IS what you are asking about - cut the wires to the old thermistor , strip back a half inch and connect to new thermistor using small ( blue ) wire nuts and then fill the wire nuts with silicone caulk to prevent moisture from getting to the connections
it is a(NNN) NNN-NNNNfreezer control. it appears to "plug in" somewhere and has a short temperature probe.