How do you unclog the overflow air conditioner drain?

To unclog the overflow air conditioner drain, first turn off the power to the unit to ensure safety. Use a wet/dry vacuum to suction out any debris or standing water from the drain line. If that doesn't work, try using a mixture of vinegar and water or a commercial drain cleaner to break down any buildup in the line. Lastly, check the drain pan for blockages and clean it as necessary.