Pop off the windshield wipers and remove the plastic cowl cover. Check that all your drains in that cowl/AC intake area are free of leaves and other things that can block the drains causing it to back up and flood in through your AC/Heater intake. Also check the AC Evap drain line where it runs through the firewall on the lower passenger side, make certain its clear or all the condensation from the AC and any other water that enters the Evap/Heater box will make its way onto the floor on the pass side. I would be leery of the windshield seals though.
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06-Corvette z51-6spd,b&b,K&N low miles.
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