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This is all normal. The freezer expels the heat through the condenser coils which are located inside the outer panels. Whenever you first start up the freezer or any time the door has been opened for a very long time, the compressor will overwork. The compressor will not shut off until the inside thermostat reaches 0ºF (or -18ºC). Either way, it can be about 12 hours before it finally reaches the temperature depending on how long you had the door open and working on it but after that the unit should start to regulate the temperature and the outside will get much cooler and just be mildly warm like normal.
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