How deep does water need to be for the transmission to get flooded?
2 Answers
If the water level is higher than the vehicle's air intake, water can enter the intake pipes and flood the transmission. The hazards of a water-damaged vehicle include the following two points: 1. Interior impact: Prolonged soaking can cause materials such as carpets and seats to deform, become rough, and produce odors, leading to bacterial growth. Moisture trapped under the carpets can cause electrical wiring harnesses to short-circuit due to dampness. These soaked components should ideally be replaced to avoid long-term water damage effects. 2. Door panel impact: The door panels contain sound insulation padding, which needs replacement after water exposure. The wheel bearings must also be replaced because their seals contain lubricating oil, which can corrode and degrade, losing its lubricating properties and compromising driving safety if not replaced.
I usually commute by car, and I pay special attention to the wading depth issue during heavy rain. Generally speaking, when the water depth exceeds the center of the wheels, approximately 15 to 20 centimeters, it can easily cause water to enter the transmission because there is a vent hole at the bottom of the transmission. Once the water level rises, it can seep in. This is very dangerous. A friend of mine had his transmission oil contaminated as a result, leading to internal parts rusting and ultimately requiring a full replacement, with repair costs starting at least 5,000 yuan. Moreover, after water ingress, the vehicle becomes difficult to start and may suddenly stall on the road, posing a huge risk. I recommend that everyone estimates the water depth visually before driving through rain or flooded areas, testing the water with a stick or leg, and never taking risks. If you must cross, try to pass through slowly and steadily at low speed, avoiding a surfing-style splash. Different cars have different designs, with sedans being lower and SUVs slightly better, but the general rule is: if the water reaches your knees, don't force it.
