How to clear a small blockage in the AC drain line?

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Method 1 – For Small Blockages in the AC Drain Line. 1. Turn HVAC system off. 2. Locate cleaning port. If the unit has turned off due to a blockage, you may need a bucket to collect the condensation resting in the drain pan. 3. Remove cleaning port cap. 4. Assess clog. If you can see the blockage, attempt to remove the blockage.

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