Why is there water leaking on the passenger side floorboard of your Ford Thunderbird?

Water leaking on the passenger side floorboard of a Ford Thunderbird can be caused by several issues, such as a clogged or damaged windshield drain, which allows rainwater to overflow into the interior. Another common culprit is a faulty door seal or window seal that fails to keep water out. Additionally, a malfunctioning heater core may leak coolant, which can also manifest as water on the floor. It's advisable to inspect these areas promptly to prevent further damage.