What Causes the Sound of Water Sloshing Inside the Car?
2 Answers
The reasons for the sound of water sloshing inside the car: 1. The sound of circulating water from the water pump, which is normal; 2. The drainage holes at the bottom of the door are blocked by mud or sand, causing rainwater to accumulate inside the door. When braking or driving on uneven roads, the door will produce a water sloshing sound; 3. A clogged air conditioning drain hole can cause water to accumulate in the evaporator box, resulting in a water sloshing sound while driving. When water enters the door and remains trapped in a sealed space for a long time without evaporating, it will create a sloshing sound. Car owners should promptly check the drainage holes inside the door to prevent blockages.
I've experienced hearing water sloshing inside the car while driving several times, which is mostly caused by water accumulation in the door cavities. The interior of car doors is hollow, and during car washes or rain, water seeps in through window gaps or door edges, collecting in the bottom cavities. If the drainage holes get clogged with leaves or mud, the water can't drain out, causing it to slosh around when turning or braking. When I first bought my car, I ignored this sound, resulting in a large rusted area on the door panel, almost requiring replacement. Now, after every car wash, I routinely check the small drainage holes at the bottom of the doors, using a small wire to clear them and ensure the water drains completely. While this issue isn't major, prolonged neglect can lead to water corroding the door panel structure and affecting the smoothness of door closing. Regularly cleaning the drainage holes can save a lot on repair costs.
