There is water in the back passenger floorboard when it rains. I have checked the seals on front and back doors. I also made sure that the windows were up all the way, and checked the trunk, but no luck. I’m stumped?

Answer

Have you checked the front passenger carpet? When it's raining, people use there defog mode on the windshield. This uses the AC to remove moisture from inside the passenger compartment. If the AC drain (located on the front passenger floor near the firewall) is clogged, it will leak onto the front floor and flow into the back. So check the front carpet as well, and let me know what you find, thanks.

Updated on March 10, 2018

Original Article:

Water Leaking Into a Car
By Eddie Carrara

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