The quickest immediate fix to stop an air conditioner from freezing up is to turn off the cooling mode at your thermostat and switch the fan setting to "On." This stops cold refrigerant from entering the coils while blowing warm room air over the ice to melt it. Once the system thaws, the absolute fastest permanent fix to prevent it from happening again is to remove and replace a severely dirty air filter, which instantly restores proper airflow across the evaporator coils. Verification: Check that chilled air flows smoothly and lines remain frost-free after restarting cooling.
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