What to Do When Driving Through Deep Water
3 Answers
When driving through deep water, try not to stop, accelerate, shift gears, or release the throttle. When driving through relatively deep water, engage a low gear, usually second gear, and maintain a steady throttle to pass through slowly. If the water level is higher than the air intake, the engine may suck in water, causing it to stall. If the engine stalls due to water intake, do not attempt to restart it, as this can lead to severe engine damage. Even if you have purchased flood insurance, the insurance company will not cover damages caused by restarting the engine, so drivers must be cautious. The key to passing through deep water is to engage a low gear and maintain a steady throttle for a slow and controlled passage. When driving through deep water, some electronic systems in the car may malfunction. If the vehicle is equipped with electric power steering, the steering assist system may fail. Similarly, if the car uses an electronic brake assist system, the braking system may also malfunction. If the water is too deep, it is best not to drive through it, as the numerous electronic devices in the car could be damaged or malfunction after passing through deep water, compromising driving safety.
When encountering flooded sections, I usually get out of the car first or use a stick to measure the water depth. If it exceeds half the tire height or the exhaust pipe level, I have to detour. Last summer during heavy rain, I attempted to cross when the water reached the wheel hubs, resulting in water entering the intake and causing the engine to stall—I regretted not checking beforehand. Drive slowly to maintain steady engine RPM, avoid sudden braking to prevent water splashing. If the engine stalls, abandon the vehicle immediately and do not restart it, or the engine will be ruined. Afterwards, tow it to a repair shop as soon as possible to check the air filter, electrical wiring, and brake system. Always keep an emergency kit in the car, including a flashlight and a life hammer, to prepare for unexpected situations.
When crossing deep water, extra caution is required. My experience suggests considering passage only when the water level is below the wheel hub. Engage a low gear in advance and proceed at a steady speed, avoiding sudden fluctuations in throttle. Water can easily enter the engine through the intake, causing hydraulic lock; there's also a high risk of short circuits if electrical components are submerged. After fording, immediately check if the air filter is soaked and ensure there's no water residue in the exhaust pipe. Don't assume everything is fine once you've passed through—water may accumulate in gaps like inner door sills, leading to rust. Remember to open the windows and drive slowly for a while to dry out the interior, preventing bacterial growth.
