How High Can Water Rise Before a Car Cannot Start?
3 Answers
If the water level does not exceed half of the tire height, it is generally safe to drive. Below is relevant information about water entering a car: Hazards: If water enters the car, many electronic components may be submerged, leading to short circuits and damage. If water enters the engine through the air intake, it can cause severe engine damage. The consequences of engine water ingress are serious, ranging from major engine repairs to complete engine failure. Precautions: During heavy rain, it is advisable to avoid driving and park the car in a higher area to prevent water submersion. If water rises above the door level and enters the car, the vehicle is considered flooded. If the car is found to be flooded, check if it can still start. If the car can run without any issues, the priority is to remove the accumulated water inside the vehicle.
I've been driving for almost twenty years and have seen many cases of flooded cars. Once the water level reaches the middle of the wheel hub, that's the metal center part of the wheel, never attempt to start the engine. Water can easily backflow through the exhaust pipe or air intake. When the engine compresses water instead of air during ignition, it creates a huge pressure difference, which can bend piston rods in mild cases or cause the engine to explode and be completely destroyed in severe cases, with repair costs potentially exceeding tens of thousands. I remember my neighbor's car got flooded during the flood two years ago—he tried to start it and the engine seized on the spot, forcing him to replace the entire engine. After driving through water, don't rush to start the car. It's best to disconnect the battery's negative terminal to let the car dry out, or have it towed to a repair shop for a thorough inspection. Safety first is always the right approach.
I just got my driver's license, so I'm particularly cautious about flooded vehicles. My instructor taught me that if the water depth exceeds half the height of the wheels, I should be alert and avoid starting the engine. Water might seep into the exhaust pipe or the engine's air intake system. Starting the engine could draw water in, which when compressed could damage internal components, like causing piston deformation. Last time I drove through a puddle in the rain, the water reached the middle of the wheel hub, and I noticed unusual noises from the car. Fortunately, I didn't start the engine and called a tow truck directly. When driving through water, it's essential to go slowly. If the water is too deep, stop immediately. After driving through water, don't neglect checking the electrical system. I learned from online resources that improper handling of flooded vehicles can lead to short circuits or even fires, which is extremely dangerous.
