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find the two hoses that go to the heater , disconnect from the heater core pipes ( normally in the engine compartment at the firewall) and place a joiner in the hoses and clamp up tight---
heater out of the circuit --
Rule out leak from water pump. What engine is it - 3.0 3.8. Could be intake manifold gasket. Have the cooling system pressurized, about 12 lbs. and look for leak, bubbles.
check oil for coolant in oil also. Possible head gasket leak.
The heater core would be the suspect in this case as the only sources of water in that area are the heater core and AC evaporator. May only be leaking under high heat and presure, the new thermostat may have helped this for a while but if the pressure is too great and there is a hole then the water will find it. Could also be a hose dripping inside the firewall for the heater core.
Sounds like one of the connections to the heater core are leaking. Should be hoses connecting to the metal heater core pipes. The heater core is on the inside of the car with metal pipes going through the firewall to heater hoses.
probably leaking heater core. you may have low coolant level now. the only place water comes in the cabin is for the heater, that has got to be it. the heater core can be bypassed (like my car's is) by simply cutting the hose that leads into the car and leave about a foot, make a big U out of it and plug the other side of the hose into the coolant passage that returns from the heater core and leads into the intake manifold. pretty easy you will need a knife, hose clamps, and common sense. the third one is a little harder to come by! :)
before u replace heator core check the drain for the a/c it is possible that it is clogged with something if the liquid is clear to jack the car up on the pass side.get up under and look where the under bottom the car and firewall meet should be a hose that is not attached to nothing coming out of the bottom of the car. when u find it blow air in to it and it should come unclogged. it is possible that the hose is push back in to the car. if so put the carpet back on the passenger side look under the back a/c box should be next to the firewall of the car put it back on. good luck
ok most cars you wont see a physical drip because the box is sealed to the firewall it will run out the drain hole the same as the ac if bad enough they will leak down the insulation right to the floor board running pure water will cause rust but rarly causes the heater core to blow what you arre looking for is the problem that started it all why she was adding water to begin with you didnt mention the type of car and motor so i really cant get into diagnostic procedures you can bypass the heater core on most cars if it is using that much water you propably have a blown head gasket that will make the heater core blow let me know the type of car and I will help you diagnose it further
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