I need to clear the A/C condensation drain line because water is coming into the cab and the carpet is soaked. Where is it located and how do I get to it? How to I clear the line after I do find it?

I assume there are no leaks in the windows or sunroof.
One probable cause, is the Air Conditioning unit. On all cars there is a drain line for the AC unit. As a unit runs, it produces condensation. (Just as a bottle of cold water produces condensation in a warm, humid area). That water has to go somewhere, so there is a drain at the bottom of the system. That drain (which comes out under the car, usually centered under the dashboard area), can become clogged or pinched and leave the water to accumulate in the system base, (again inside the car, under the dash). When this happens, the water will seep under the carpet and find the lowest area, which in this case, is the floorboard in the back seat area.

98 grand cherokee limited 5.2L same problem found leak not from heater box but from drain mount on firewall under the glove box not behind it. drain line should be located behind right front tire in the frame. Turn your wheels hard left look inside fender well right side towards back side. hole in frame where drain line should come out.

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.

What your seeing is the condensation from the AC dripping in to the passenger compartment. In the condenser area of the AC unit is a small drain line, with time this can and will plug with debris, (bugs, dust, leaves ect) properly place the car on jackstands and locate the drain line, use a small fine wire (or long pipe cleaner) and run thru drain tube clearing the blockage. You mayhave to repeat several times as new debris gets in to the line.
PLease let me know if this had asisted.
Best regards,
Tom

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!

Look under the hood where the ac lines go into the firewall,and look directly below it,it may have a elbow boot like thing on it,just pull it off and use compressed air to blow the drain out,it will come out like a water fall when it is unstopped,if this was helpful,please rate,thank you.

There is a drain stopped up,look under the hood,right below where the ac lines go into the firewall inside the car,the drain will be there a the bottom,use air pressure to blow into the drain to clear it out,when clear,it will flow out like a water fall.

they broke the evaporator drain its that simple have them fix it. They should be responsible for there sloppy work.

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)

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.
Bill