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heater core
It could possibly be the heater core Check your heatting and a/c
A leaky door seal or windshield seal
the fuse box is located in floorboard on drivers side. the fuse relay box is located under hood on drivers side.
The heater core has gone bad or possibly a hose leading to it or away from it has gone bad.
On the majority of cars and trucks it is located under the hood, on the firewall, drivers side. On some older vehicles it was located under the drivers floorboard.
A damaged heater core will cause coolant or water to leak onto the passenger floorboard.
You have a leak either around your windshield or in the firewall. The best way to find the leak is to bring it through a car wash and watch it
The 1973 VW Beetle low beam switch can be found on the drivers side floorboard. The low beam switch will be all the way to the left of the drivers side floor.
Heater core leaking or "bad"/ repair/replace. 4-8 hours labor + parts... pain in the rear (not the cars)
There is a red button mounted under the floorboard in the trunk on the drivers side. That is the fuel shut off.
passenger side floorboard, under carpet or behind trim molding on the right side of floorboard