Question about 2000 Pontiac Montana

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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?

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You will have to jack the van up and put it on jack stands.(never worn with just the jack) you will see a elbow just above the steering rack on the pass side of the van. its made of rubber. I us a coat hanger.Just be careful you dont go to far, if you do you may poke a hold in the evaperator. If you clear that it should fix your problem. then check that you cabin filters are in place. if there insatllewd wrong or missing you can get **** falling into the hvac system causing this problem.

Posted on Aug 18, 2011

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Posted on Jan 02, 2017

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1 Answer

What can cause floor in the back, (behind the front passenger seat) to be soaked with water (& I mean SOAKED) ?


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.

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I just found my floormats and floorboard soaking wet, can you explain?


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.

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2001 mitisuubishi galant when the AC is used the carpet under driver seat fills with water.


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.
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My floor boards in my Cavalier are Soaked ..


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!

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