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Robert, Using a cooling system pressure test tool to pressurize the entire cooling system, a heater core will leak into the HVAC [heater, ventilation and air conditioning] box [located under the dash board]. Once coolant leaks into this box, it will either drop onto the carpeting on the passenger side front floor OR drip out the condensate tube [where the A/C condensate water leaks out under the truck] The condensate tube is a rubber pipe located on the lower end of the passenger side firewall. Leakage into the passenger carpet [most common place for it to leak] will appear as a wet carpet. If heater core replacement is required, do yourself a favor. Buy and install a new A/C evaporator [located in the HVAC box with the heater core] at the same time. This is a big job to do. No sense replacing the heater core now, only to have the A/C evaporator fail next summer, forcing you to repeat all that labor [8 hours for a pro mechanic who knows what he is doing].
Have you been adding any coolant? You could have a leaking heater core, which will usually leak to the inside, wetting the carpets in the well. Most American cars locate the heater core on the passenger side of the firewall, so a leak will typically show up on only the passenger side floor. I once had an Audi that had the heater core mounted just about dead center on the firewall. When it started leaking, both sides of the well(s) got wet.
is it only when the ac is on? there is a pan under the ac unit that has a hole in it to allow the condensation to empty. if that hole gets plugged it could cause the condensation to build up and back into the inside of that car. i unplugged mine and floor stayed dry
hi yes your 100% right the heater core/matrix is leaking, the water is dripping down from it which is making the floor wet, and the reason you are getting "steam" on your screen is the hot water that is between the fins on the matrix is cooling causing condensation...so yes you are right..hope this helped
look under the car there are plugs located in the floor look to see if the plug has rotted , the ac condenser still condenses water even if it is not turned on check to see if the drain on the fire wall(located on the fire wall passenger side towards the bottom)is plugged with mud or debris, if it is not plugged the heater/ac unit shell may be cracked allowing water to seep, also check around the front window for leaks.
look at the firewall on the engine side and you will see a small stub hose coming out on passenger side about even with the bottom of the heater box inside. that hose drains condensation from the ac...clear it out and you will have a dry floor. (unless heater core is leaking but you didn't mention any overheat or coolant loss so likely that's not a problem)
Check the freon level in the A.C. unit, that's condensation, also you will want to replace the cabin air filter, and clean the drain plug at the bottom of the temperature control unit(big box where the evaporator, heater core, and blower motor are at).