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Author: BenjaminNelson via YouTube
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I removed one of the "Ski-Side Rails" on my 2013 Tesla Model S. I was shocked at how much dirt was packed in near the front. This is just behind the passenger side front tire.
The dirt gets into the pressure-relief "umbrella valves" and moisture can get into the battery pack, cause corrosion, and eventually prevent the car from driving.
See the full playlist on repairing this car at: https://www.youtube.com/watch?v=Knxy-tSc6F0&list=PLmHss3DBZUinXAtGsho-xSke6Wy0M0sWe&index=14