What is the biggest problem with flood-damaged cars?
2 Answers
Flood-damaged cars are generally categorized into three levels: water-soaked cars, water-logged cars, and fully submerged cars. Water-soaked cars suffer minimal damage to the vehicle body, as a small amount of water entering the interior typically does not cause significant harm. Water-logged cars, where the water level reaches the waistline of the vehicle, usually experience corrosion to the electronic wiring, engine compartment, and interior. Although these cars can be repaired and used again, they pose significant hidden dangers. Fully submerged cars, where the water level exceeds the roof, can only be scrapped. Fully submerged cars are further divided into three scenarios: water level above the exhaust pipe but below half-wheel height, water level exactly at half-wheel height, and water level above half-wheel height. Generally, water reaching half-wheel height can already affect the car. Below is a detailed explanation: Water level above the exhaust pipe: If the water only covers the exhaust pipe, simply move the car away promptly. Water in the exhaust pipe will not be sucked back into the engine, and engine stalling is primarily due to water entering the engine's intake system, unrelated to the exhaust pipe being submerged. Water level exactly at half-wheel height: If the water reaches exactly half-wheel height, the car usually will not leak. However, if the car remains submerged for an extended period and the sealing strips have aged, leakage may occur. In such cases, drive the car to a 4S shop, dismantle the interior, and clean and dry it. Water level above half-wheel height: If the water exceeds half-wheel height, the engine may take in water, and the interior may also leak. Under no circumstances should the engine be started to avoid damage to the engine or electronic components. Additionally, if the car is submerged and starting it causes damage, the insurance company will not cover the costs.
I've always believed that the biggest issue with flood-damaged cars is their electronic systems. After being submerged, circuit boards and sensors can corrode, leading to problems like erratic headlight flashing, engine failure to start, or even malfunctioning air conditioning. When driving, the braking system is also prone to water damage, and sudden failure can cause accidents. In the long term, the car interior can develop mold and bacteria, causing respiratory discomfort for passengers. Repairs are particularly costly, and even replacing parts may not completely solve the issue, as residual water continues to erode metal components, eventually leading to premature scrapping of the vehicle. Safety comes first—when buying a used car, it's essential to avoid flood-damaged ones, or you're essentially paying for trouble.
