At what water level will the transmission get flooded?

2 Answers
KinsleyDella
07/25/25 7:31am
Water exceeding two-thirds of the wheel height or splashing waves during oncoming traffic can cause transmission flooding. Water exceeding two-thirds of the wheel height: When water surpasses two-thirds of the wheel height, there's an 80% to 90% chance of transmission flooding. If water reaches the dashboard level, the transmission is 100% flooded. Splashing waves during oncoming traffic: Excessive road water can create splashes that flood the transmission upon hitting the vehicle body. Effects of transmission flooding: Flooding severely compromises transmission fluid performance, impairing both lubrication and power transfer capabilities. This leads to clutch slippage, elevated oil temperatures, potential steam generation, and even boiling of the fluid-water mixture. These viscous substances may accumulate in the valve body, causing blockages that affect the transmission control system.
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SpencerRose
08/10/25 6:34pm
Water level is not absolute, but transmission flooding commonly occurs when the water depth reaches halfway up the wheels or higher. The breather tube is the key ventilation port for the transmission, usually located beneath the chassis. Once the water level exceeds the breather tube, water can easily seep inside. Most sedans may face risks in water depths of 20 to 40 cm, while SUVs can handle slightly higher levels. After flooding, the mixture of oil and water can emulsify and deteriorate, causing gears to rust and seize, leading to costly repairs. Be cautious of waterlogged areas when driving during the rainy season, especially during urban flooding. Check the vehicle's undercarriage after parking or wading through water, and avoid lingering in deep water. Older vehicles with aged seals are more prone to water ingress, so during routine maintenance, ask a mechanic to inspect the breather tube's condition.
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