Over the past 2-3 weeks we've had a bunch of rain in Houston and I noticed ever time it rains (and I'm driving) my carpet gets soaked both front and rear floor boards. There is no evidence that my sun roof is leaking or the weatherstrip on the doors are failing. I don't run my ac much and I've only noticed this when I drive in the rain. The right side of seems to be drenched more than the left side.
I have an 04 gp gtp