How to Unclog the Sunroof Drain Pipe of Nissan Sunny?

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Here are the methods to unclog the sunroof drain pipe of Nissan Sunny: 1. Syringe injection method: Connect a syringe to an infusion tube, first extract the accumulated water in the drain trough to avoid backflow caused by forced injection. 2. Extract the accumulated water: Fill the syringe with clean water, point the outlet of the infusion tube towards the entrance of the drain pipe, control the force based on the resistance during injection. Once water overflows, use the suction method to extract the dirty water mixture. Repeat this process several times to unclog the drain pipe. 3. Air gun blowing method: Use high-pressure airflow to pressure-clean the drain pipe. When unclogging, wrap a piece of cloth around the nozzle to prevent dirty water from splashing onto clothes and the vehicle. Avoid setting the air pressure too high, as it may cause the rubber joint and drain pipe to detach, worsening the leakage problem. After blowing, pour clean water into the entrance of the drain pipe and check if water flows out from the outlet near the tire mudguard. If water flows out, it indicates successful unclogging.