No, an air conditioner will not unfreeze on its own while continuing to run in cooling mode. In fact, if you keep the AC running while it is frozen, the ice layer will thicken, block all airflow, and potentially cause liquid refrigerant to flood and destroy the compressor motor. To unfreeze your AC, you must manually turn the thermostat to the "Off" position (or switch the fan setting to "On") and let the system sit undisturbed for 3 to 6 hours until every trace of ice melts completely. Verification: Inspect the indoor evaporator coil and copper suction line to confirm all frost and ice have melted away.
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