What Causes Abnormal Noises After a Car Passes Through Water?

[Margaret]

Here are the specific reasons for abnormal noises after a car passes through water: 1. Water on brake pads: If the vehicle wades through shallow water and water splashes onto the brake pads, it is normal to hear abnormal noises when braking. 2. Foreign objects between brake pads and calipers: If the vehicle wades through shallow water and foreign objects like plastic bags or mud get stuck between the brake pads and calipers, this can also cause abnormal noises when braking. 3. Water ingestion in the exhaust pipe: If the vehicle wades through deep water and water enters the engine through the exhaust pipe, it can prevent the fuel and air mixture in the engine from burning properly, leading to abnormal noises. 4. Foreign objects stuck in the chassis: If foreign objects get stuck in the chassis after the vehicle passes through a waterlogged area, abnormal noises may also occur while driving.

[McGrant]

After driving for so many years, I've encountered several instances of strange noises after driving through water. Based on my experience, there are several common causes for these noises. First, belt slippage—when water splashes onto the belt, the rubber becomes slippery, causing a high-pitched squealing sound when rubbing against the pulley, especially noticeable during acceleration. Second, water entering the wheel hub bearings can lead to rust, resulting in a continuous grinding noise that sounds like creaking. Third, if the water is deep, it might rush into the exhaust pipe, causing a bubbling gurgling sound, or enter the air filter, which, when wet, obstructs airflow and produces a snoring-like noise. My advice is not to rush off after driving through water. Let the car sit for a while to dry, and listen to identify the source of the noise. If the noise persists, check the belt tension, bearing condition, and any water accumulation under the chassis. Ignoring it could lead to expensive bearing replacements and compromise driving safety. In general, to prevent issues, avoid high speeds when crossing water and ensure the water depth doesn’t exceed half the wheel height.