I have a 98 Toyota Rav4 4cyl auto. Started to leak water from somewhere into the passenger side floor when it rains. Started out only leaking during heavy/fast rain, but now almost every time. Thought it was the sunroof drain overflow, but no water on the seat cushion, and I reamed both drain tubes out with a stiff wire all the way to the ground and confirmed water runs out the properly. Now I think it’s something in the firewall, like maybe the vent air? Tried taking the screen off the cowl and looking down into what I presume are the vent ducts, but didn’t find any drain rail. Anyone have any idea how to fix this? Do I need to take the dash apart?