Water leak in footwell 2000 grand cherokee

A simple test is to feel around the carpet in that footwell. See how far up under the dash the carpet is wet. Does it only happen after rain? Do you have a sun roof fitted?
If the carpet is only wet low down on the floor the most likely reason is either a perished or damaged door seal rubber, a faulty sun roof seal or the drain channels for the sun roof are clogged up. Check the footwell in the back as water always flows and settles at the lowest point in the vehicle.
If it is high up and nearest the middle of the dash you issue could be the heater matrix under the dash but as it seems to be only on one side this might not be the issue.
Door seals are a simple case of pull the old one off and push the new one on and they don't cost silly money to buy. Heater matrix issues, unfortunately, usually involve taking the whole dashboard out to get to it.
Hope this helps.

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.

Do you have a sunroof?you might need to clean drain tubes.have you had a windshield replaced?or it could be a body seem.you will need to remove panels and lift up corner of the carpet and run the garden hose over the area and check for water in vehicle.

hi all have an audi a4 convertible 06 plate just cleaned it only to find wet carpet drivers side bulled back carpet and found about an inch of water heeelllppp

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.

the heater core is leaking

Check under the hood on the firewall on the driver's side. There are body grommets which sometime crack, fall out, or are damaged by stereo installers, trailer brake controller installation, or CB/shortwave radio installers. Also, if you smell antifreeze, it is a coolant leak. If you smell mildew, it is rainwater entering the cabin. Your windshield could be leaking.
And the worst, and incurable: a body seam weld could have broken.

This sounds like your heater core needs changed.

the water sound i believe is from being low in antifreeze..if you are adding water oncce a week then there is a leak.. try looking on the inside of the car on the passenger side carpet to see if its wet..if not, then check things under the hood such as, heater hoses for heater core, water pump, thermostat housing, radiator, core plugs, block heater..if the smell is coming from the inside and there is a film on the window, then chances are you need a heater core....try that.

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