Originally Posted by
RB Racing
I had a similar problem in my C5 but the water was in the passenger side and what it ended up being was water not being able to drain for the A/C. There is a rubber tube for the drain with a slit and it was plugged so with the A/C being on for long periods the water could not drain out filled up and drained inside the car.
The drain had leaves and pine needles and crap in there. Snipped the bottom of the tubes and everything was fine after, the cowl even had a couple of drains so it may be worth checking on an F-body also.