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Can Water Enter the Transmission When a Vehicle Drives Through Water?

2 Answers

HazelMarie

07/24/25 6:51am

When a vehicle drives through deep water, there is a possibility that water can enter the transmission, leading to malfunctions. Below is an introduction to transmission water ingress: 1. Water ingress scenarios: (1) The first scenario is when the vehicle is submerged in water. The specific criterion is that if the water level exceeds two-thirds of the wheel height, the probability of water entering the transmission is around 80% to 90%. If the water has reached the dashboard level, the transmission is 100% submerged. (2) The second scenario occurs during oncoming traffic. If there is excessive water on the road, the splashes hitting the vehicle body may also cause water to enter the transmission. 2. Impact of water ingress: When water enters the transmission, the performance of the transmission fluid is severely affected. Not only is the lubrication performance compromised, but the power transmission capability of the fluid also decreases, which can lead to clutch slippage.

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LucyMarie

08/11/25 2:37am

I remember driving for over 20 years, and once after a heavy rain, I drove through water that was too deep, causing water to enter the transmission. This led to sluggish gear shifting and oil leaks, nearly totaling the transmission. Actually, the transmission vent is positioned low, making it easy for water to seep in when the water level rises. That repair cost me several thousand dollars, including oil changes and system cleaning. Now, whenever I encounter standing water, I either pull over or detour, making sure the water depth never exceeds the midpoint of the tires. After driving through water, it's advisable to check the transmission oil—if it appears milky or has water droplets, it means water has entered, and immediate repair is necessary. Regular maintenance should include checking the vent location, as some car models have design weaknesses that are easily overlooked. Don’t assume a higher vehicle clearance makes you safe—safety first is always the right approach.

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