CLEAR FLUID LEAKING INSIDE CAR ON PASSENGER SIDE. LARGE AMOUNT HAS LEAKED OUT. IT CONTINUOUSLY LEAKS, CARPET IS NEVER DRY. CAR RUNS FINE OTHERWISE

It's a sealed system, so it's got to be going somewhere, leaking somewhere (or boiling off from severe braking operations over and over). Since you likely haven't experienced extreme braking, it must be leaking somewhere.
You will have to trace all your brake lines from the master cylinder to each wheel to check for any sign of leaking. Front calipers are easy to spot leaks when they leak. If you have drum brakes on the rear, you may need to pull off the drum to check the wheel brake cylinders. Peel back the rubber boot on each end of the wheel cylinder and look for any fluid leaks there.
Another place to check is at the back of the master cylinder. If a seal is bad there, it has been known to leak fluid inside the car, under the dash. Feel around the carpet under and behind the brake pedal for any wetness. If you find brake fluid there, you will need the master cylinder replaced or rebuilt.
Hope you find the problem. Don't forget to check the ABS system and brake lines, too.

Put a large piece of light paper under the cars or truck motor area and let it set overnight. In the morning see what color the fluid is. Put your finger in the fluid that has leaked if any is there and see if it feels like water or oil. Coolant could be orange or green depending on the type you use. Coolant can sometimes be confused with transmission fluid. Check the water hoses that go into the dashboard for leaks. Also check for dampness on the passenger side of the front seat on the carpet area. If it is wet it is your heater coil that has a leak. Hope this hopes.

is the heater-core inside the car on the passenger side leaking.you can check the inside of the firewall, on the passenger side.

check water pump

If you smell it in the cabin you probably have a leak in the heater core which is up under the dash. Look under the center portion of the dash on both sides and try pulling the carpet back in that area. Chances are you will find evidence of a small leak. Check all hoses for tightness that run along the firewall in the engine compartment as well.

If you've been using your air conditioner during this time, and it hasn't rained at all, then the small drain at the bottom of the a/c evaporator core may be plugged. When you use the a/c to cool the car the evaporator coil [located next to the heater core in the ductwork under the dash] is very cold and moisture from the hot humid air condenses on it as a result. This condensation dribbles down the core and accumulates in the plastic housing under it where it should then drain out a small hole and drip onto the ground. If the small drain gets plugged, which happens quite often, then the water fills up the housing until it overflows and then runs out and soaks the carpet on the front passenger side. The drain is located on the engine side of the firewall, passenger side, down low where the firewall begins to curve under. Usually a puff of air will clear the clog and the drain will work fine again. If the carpet is really wet it would be a good idea to remove it and get everything dry again as it tends to get pretty smelly if left wet. One last note: usually a leaky a/c unit will only make the passenger side carpet wet unless it's been leaking for a long time while a leaky windshield seal can make both sides wet depending on where it is leaking. Good luck, hope this helps you out!

the water drain for the ac system is clogged.
the inside coil gets cold and water drips off of it and needs to drain to the outside.
there should be a drain spout on the outside of the fire wall.
this small drain needs to be cleared.
let me know if this helps
thank you
jm

the water can travel along surfaces or beams in the car so you cannot tell where it is actually leaking. in my ford windstar water leaked in right over the fuse box. it ran along a cross beam from the passenger side. if it has those plastic strips they use to go in between small gaps in the metal... like along the roof where the roof is and the metal of the sides joins it is likely they are leaking. best to take a garden hose and have someone inside the car with a flashlight on the floor looking for leaks

under car pass side just behind tire on firewall looking for tube that makes 90 degree bend make sure not clogged if still leaking check for cracks in the evap case

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)