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Afternoon D. So the refrigerator for the thermistor and freezer are the same part which is why they don't show the thermistor inside the freezer separately but you can get the same one that shows up in the refrigerator section and that is also used for the freezer.
The evaporator should be lightly frosted from top to bottom whenever it's trying to cool whether it has an electronic damper or a manual damper. That doesn't affect the frost pattern at all.
No problem, I can look up the part if you want to send me a model number, but if you're getting a defrost issue, that thermistor isn't going to have anything to do with the issue.
Sorry, I just saw you gave me the model number awhile ago. So that thermistor comes with the entire wire harness in the refrigerator and it's part number 12868701. But again, the only reason to order and replace this is if the evaporator is lightly frosted from top to bottom (like it should be) but the temperature is off.
The refrigerator thermistor is what controls the damper assembly, but again, the only time to consider the thermistor being out of range is when the evaporator is lightly frosted from top to bottom (like it should be) but the temperature is off inside the refrigerator. To know whether the damper is bad or the thermistor is bad, you'd need to test the thermistor at room temperature and it should be 10k ohms.
So the part number I gave you was for the REFRIGERATOR wiring harness. You'd have to contact a parts store to look up the one for the freezer because it's not listed.
As for defrost issues and thermistors, thermistors can cause a defrost problem but only when it's a defrost thermistor which is clipped onto the copper coil going to the evaporator at the top of the evaporator---this refrigerator doesn't have one of those. It just uses a bi-metal thermostat only.