Why is there water dripping under the Passat?

[LaKylie]

In summer, the reasons for water dripping under the car include exhaust pipe dripping, body drainage pipe dripping, and air conditioning drainage pipe dripping. Exhaust pipe dripping: When the combustible mixture enters the engine cylinder for combustion, it produces carbon dioxide and water. The water vapor discharged from the engine condenses into liquid water after passing through the catalytic converter, muffler, and exhaust pipe. Under the airflow generated by the engine's high-speed operation, the liquid water is expelled along with the exhaust gas from the exhaust pipe, resulting in the phenomenon of water dripping or spraying from the exhaust pipe. Body drainage hole dripping: There are interlayers and gaps between the body and the chassis steel plates. To prevent rainwater accumulation in these areas from causing rust, drainage holes are designed in certain parts of the body and chassis to allow rainwater and melted snow to drain quickly. Drainage holes are usually located on both sides of the windshield wipers, and rainwater near the front windshield flows out through the guide plate from these holes. Air conditioning drainage pipe dripping: In summer, the use of air conditioning is very frequent. When the air conditioning is operating, condensation water is generated in the evaporator box of the air conditioning system. Normally, this condensation water is discharged outside the car through a dedicated drainage pipe. If the drainage pipe is blocked or bent, the water cannot flow out and will instead leak onto the car's floor mats.