Typically that leak is caused by a leak in the heating system. The heater core is under the dashboard, just above the passenger side.
You will need to replace the heater core.
This probably means that your heater core has sprung a leak ; you will probably find the passenger side damp form the leak itself - check with your mechanic .
cap is off
Most likely a leak in the heater core, should be on the passenger side under the dash.
You would have a leak, from either the pipes to the heater matrix (radiator), or the matrix itself.
heatercore leaking! also change thermastat.
The car will over heat.
there might be a leak some where in a coolant line. or maybe you have a leak in your radiator.
check your blower motor, located under the dash board. its on the passenger side. if the leak is on the drivers side, i have no clue. but my hubby's car is leaking water from the blower motor on the passenger side. found out at the car wash...
It depends on how bad the leak is .If its a really bad leak to the point where the car is starting to overheat then no