Stopping an indoor air conditioner water leak requires resolving the underlying drainage blockage or airflow failure. Step 1: Turn off your AC at the thermostat to stop water production. Step 2: Locate the PVC condensate drain line and clear out clogs using a wet-dry vacuum connected to the exterior outlet pipe. Step 3: Remove and replace a severely clogged indoor air filter, as dirty filters freeze coils that melt and overflow drain pans. Step 4: Pour a cup of white vinegar down the indoor drain cleanout port to dissolve residual algae and slime. Verification: Check that water flows freely out the exterior drain pipe once the system is turned back on.
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