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I'd give the unit 24 hours to try to get down to temperature. If it still won't get down to temperature even after defrosting and it's constantly running to try to get colder, then you have a big problem with either a freon leak or an inefficient compressor. If you had a bad thermostat then the refrigerator would be turning off like it thinks it has reached the temperature even though it really hasn't. Since it's running constantly, you'll want to give it more time and see how it evens out in temperature and if it won't get cold enough it's probably time for a new freezer because even a freon leak is about $450 to have repaired. A new compressor would be about $650.
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