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Whenever I see a system which is leaking from more than one or two places, I do a head gasket check because that tells me that the system is experiencing above normal pressures. the wet floor is a heater core. whether it's a water pump or some other thing near it only you can tell. Actually it rarely happens, but the wet floor could be the hose where it meets the heater core at the firewall; again, only you will be able to tell the difference. if the hose connection looks dry, assume that it is the core itself.
on the passenger side? if it is the passenger side is your heat exchanger carrying the coolant that is used to regulate the cabin temperature. it is under the dash. Usually what happens is that the condenser (heat exchanger) the drain hose coming thru the firewall inside the engine compartment (passenger side) clogs not letting drain the water removed from the cabin during the AC cooling process. then the water start to bleed thru the joints of the box enclosing the heat exchanger. the solution is to blow or vacuum the protruding drain hose to clear the water path.
Now if the soaking carpet smell like coolant the problem is different.
Your car probably has AC so the box under the hood has a drain for removed moisture and this can often clog with environmental debris; when that happens, the water can't drain any more and may end up inside the car.
There is a rubber drain hose that should be attached to the bottom of the cooling/ blower unit on the passenger side of the car underneath the dash. This hose drains the condensation from the cooling unit. the hose may have gotten disconnected or it may be clogged up. I have had cases where a dirt dobber built a nest up inside the hose and clogged it up. Check this hose it may be the cause of the water puddling up in your car.
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)
Is it water or coolant that leaks inside. Water will be clear, coolant will be yellowish-green or blue. If it is clear than it is just a rubber hose that is loose from the AC drain. Replace the hose and clamp. If it is coolant then you have a leaking heater core and would need to get it replaced.
It's probably a blocked a/c drain line. The condensation can't drain out because the hose is blocked w/ 'goop', U should be able to locate the drain hose in the passenger area, front seat about where your feet would be, middle of pass area. U can either blow air thru it to clear it, or from under the car, locate the end of the hose and with a small wire, gently run it up the hose to clear obstruction. The carpet padding is like a sponge, so the moisture is probably wicking to the rear area from underneath. Newer cars run in the a/c mode whenever heat or defrost is on, even though u don't turn on the a/c. Let me know how u make out.
You have drain blockage in the condesor case itself. There is a small tube that will drain the condensor case, the big black plastic case that contains most of your a/c system inside the car. This case collects moisture and that must drain normally from the case drain to the outside of your car onto the ground.. If this drain is plugged, you will have leakage on to the floor. If the moisture is allowed to remain in the carpet, mildew will set in and then you will have to replace the carpet.