Why is there water leaking from the chassis when the car stops?

1 Answers
JaydenLynn
07/29/25 9:16pm
When the car is parked, water leaking from the chassis may be due to the air conditioning system drainage or water dripping from the muffler and exhaust pipe at the rear of the car. Air conditioning system drainage: The air conditioning system drains because, in summer, the outdoor temperature is high while the temperature inside the car with the air conditioning on is low, creating a temperature difference that causes water to drip from the chassis. The low-pressure pipes of the car's air conditioning system are not wrapped with thermal insulation foam, making the pipe surfaces prone to condensing moisture from the air. Water droplets will also condense and gather at the lowest point of the pipes, dripping down. Exhaust pipe dripping: Water dripping from the muffler and exhaust pipe at the rear of the car is also a normal phenomenon, which mostly occurs in winter. Gasoline is injected into the cylinders and mixed with air, and after complete combustion in the combustion chamber, it mainly produces carbon dioxide and water. At high temperatures, water is discharged into the atmosphere in the form of water vapor. Since the muffler is located at the rear of the car where the temperature is relatively low, the water vapor will condense into liquid water when it cools down.
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