Years ago, in a Miata, a passenger stepped into my car, sloshing sounds ensued, and I was found to have a clogged AC drain (blew air into the drain on underside of car, water flew out). Water had been backing up, without any apparent notice by me, to the point that I had standing water in the passenger floorboard. I was shocked at how much water was sloshing around, but wasn't heard with the top down (top always down). Anyhow, looking forward to seeing the cause / fix of your issue.
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