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Poor Airflow due to a dirty filter,dirty evaporator,dirty blower wheel, bad or weak run capacitor, or even a bad bearing in the fan motor causing it to overheat and shut off on overload while the compressor still runs, thus causing the unit to freeze up. On some systems it is possible that when the thermostat is satisfied and the indoor blower motor shuts off, the compressor could keep running if the contactor is sticking for 1 reason or another. Examples of this would be fireants or ladybugs in contactor or just an old contactor that has burnt points that stick some or all the time after running and getting hot. -Brad75-

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