Clearing a clogged AC condensate drain line is a straightforward maintenance task. Step 1: Turn off your AC at the thermostat to stop water production. Step 2: Locate the exterior end of the PVC drain pipe where water discharges outside your home. Step 3: Use a wet-dry vacuum to create a tight seal around the PVC pipe opening and vacuum out accumulated sludge, algae, and debris for 1 to 2 minutes. Step 4: Go inside and pour a cup of warm water mixed with distilled white vinegar down the indoor T-pipe cleanout access port to flush the line. Verification: Check outside to confirm water and debris discharge cleanly from the pipe.
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