What Causes Water Dripping Under a Car?
2 Answers
The main reasons for water leakage under a car are the following three: 1. Condensation water dripping from the air conditioning system in use. 2. A malfunction in the radiator cooling system causing water leakage under the car. 3. Lastly, windshield washer fluid dripping. Inspection and troubleshooting methods: 1. First, check if the radiator coolant is low, then inspect the cooling system pipes for looseness or damage, and check the bottom of the radiator for any scratches from grounding. 2. Ensure that the coolant reservoir is not overfilled (overflow may occur when the temperature rises). 3. Check the windshield washer fluid reservoir, pipes, and connections for looseness or damage. 4. Determine if the dripping is caused by prolonged use of the air conditioning on hot days, leading to condensation water drainage (this is a normal phenomenon).
I've been driving for over a decade and often notice water dripping under the car, mainly due to condensation from the air conditioning system during summer operation. When the AC is on, the cooler causes moisture in the air to condense into water droplets, which then drip onto the ground—just like frost melting and water flowing out in a refrigerator, which is completely normal. The exhaust system also drips water, especially during cold starts when hot water vapor meets cold air and turns into droplets that exit through the tailpipe. Beyond this, if the water is clear and odorless, there's no need to worry. However, if the droplets are colored—like green or blue—or have a chemical smell, it might indicate a coolant leak, which is serious and can lead to engine overheating or even breakdown. In such cases, it’s essential to visit a repair shop to check the pipes and other components. Observing water traces on the ground after driving can help; normal dripping is common in summer, and regular maintenance can prevent issues.
