What Causes Water Dripping Under the Car?
2 Answers
The reasons for water dripping under the car: 1. If it occurs after the air conditioning has been running for a while, this is normal. It happens because during air conditioning operation, moisture in the cabin condenses on the evaporator, forming water droplets that are then drained outside the car through a collection tray and drain pipe. 2. Check if the coolant in the radiator is low. If it is, promptly visit a 4S shop to inspect the cooling system for faults. Water dripping from the muffler and exhaust pipe at the rear of the car is also normal, commonly observed in winter. When gasoline is injected into the cylinder and mixed with air, it fully combusts in the combustion chamber, primarily producing carbon dioxide and water. The water is emitted into the atmosphere as steam under high temperatures.
I've seen water dripping under cars many times, especially in summer. When you notice wet spots on the ground after parking, it's mostly condensation from the air conditioning. The AC produces moisture when cooling, and the dripping is normal—like little puddles after rain, cool and colorless with no odor. If it happens right after turning on the AC, don’t panic; just clean the drain outlet. But if the liquid is green, pink, or blue, it might be a coolant leak—like from a cracked radiator or hose. Coolant leaks can cause engine overheating or even total failure. I once saw a friend’s car break down on the highway because of this. The exhaust system can also drip water, especially clear droplets after a cold start, which evaporate quickly and aren’t a concern. However, brake fluid or oil leaks are more dangerous—oily or smelly—and need immediate inspection. Get into the habit of checking the undercarriage during car washes, and if anything looks off, head to the shop. This advice has kept me worry-free for over a decade—trust me, it works.
