How do I clear a clogged drain line in my AC?

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1 Method 1 – For Small Blockages in the AC Drain Line. Turn HVAC system off. … 2 Method 2 – For Large Clogs in the AC Drain Line. For larger blockages, use a wet-vac or air compressor to remove the blockage. … 3 Routine AC Cleaning Without Blockage. Turn HVAC system off. … 4 Contact Energy Air for HVAC Service. …