I have a 2003 Ford E350 Super Duty cargo van with a 5.4L engine. It has 110k miles and was previously used by a school in Dallas, TX. Everything seems to be in good shape overall, but I’ve noticed what seems like rainwater leaking in on the driver’s side above the foot pedals, possibly through the firewall or somewhere nearby.

Would you recommend removing the dashboard or taking apart the components in front of the van to seal the leak? What’s the best approach to fix this issue?