The cooling system of the engine.
Water on passenger floorboard.
A damp carpet or water on floor passenger side situation can be caused by a plugged ac condensate drain line a leaking heater core leaking windshield seal a problem with sunroof drains or water ingestion from the fresh air intake on your car s hvac system.
The cooling system is highly pressurized so even a small leak can force the antifreeze to come out.
If this core develops a leak it will usually leak into the passenger compartment floorboard.
Posted on oct 10 2009.
The heater core is heated by the engine coolant.
This is the first place to start the investigation when you see car leaking water on passenger side.
Air is then blown over the heater core by the blower motor when the heater is on to heat the passenger compartment.
It was definitely water and do not think it came in from the window or door seals b c the door was dry and rug area near lip of door was dry.
Sounds like your a c heater box drain is clogged easy fix just stick a hanger in hole to clear you will see water run out now for the blower it a blower motor risistor this controls the speeds and goes bad alot common problem.
This morning i noticed that my passenger side floorboard was somewhat soaked not much of anything in the rear passenger floorboard but front was soaked.
Water leak on passenger floorboard also an ac problem.