Question about 1999 Jeep Grand Cherokee

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Leak onto floor passenger side from neck of ac drain through firewall

Attempted to clear drain by back flushing with water. Leaks into passenger floor area from neck of ac drain at firewall onto carpet. Any suggestions on fix of leak?

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It's not your heater core. If your heater core is out it would leak antifreeze. My wife's 97 Grand Cherokee had the same problem. It is condensation from your AC coming leaking through a round hole in the AC unit at the firewall. Pull the carpet back and dry out underneath it, there will be a lot of water and we had to leave the carpet pulled back with a fan blowing on it all weekend to dry out. I fixed this about 8 years ago so if I remember correctly, the was a plastic part of the AC at the firewall that had a hole in it that the water was coming out of, I could see leaves and debris in the hole so I know it was part of the drain system. I cleaned out what debris I could and used a cone shaped peice of rubber and twisted it in to plug the hole and tapped over the plug to ensure that it wouldn't back out with vibrations, etc. After you dry everything off start the engine and turn the AC on max, you'll be able to see the where the water is leaking from after the AC gets cold. Hope this helps, it drove us nuts for a year before we figured it out and the wet carpet smell wasn't pleasant.

Posted on Oct 12, 2008

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It sounds like your heater core is busted. you will have to go under the dash to get to it and replace with a new one

Posted on Oct 11, 2008


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Could be the drain for the ac is plugged up. Usually when this happens the passenger side floor gets wet, but it could be coming out on the driver's side when you take a right turn.
The drain should be on the bottom of the firewall near the floor, you should see water dripping onto the ground when the ac is on.

Jul 19, 2012 | 2003 Buick Rendezvous

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How do I clear a 2006 Jeep Grand Cherokee AC Drain?

The drain would be in the engine compartment and would look something like a rubber elbow sticking out of the firewall. You could try snaking something flexible in there or I personally have used a blow gun and compressed air.

Jun 17, 2012 | 2006 Jeep Grand Cherokee

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The a/c evaporator has a drain tube that allows moisture to drain out of the car. The tube will stick down on the lower, passenger side of the engine just in front of the fire wall. You can usually only see it from below the car. Sometimes these drain tubes can get clogged with leaves or other debris from the road which doesn't allow it to drain so it backs up and leaks water onto the passenger side floor. Try to locate this drain tube and clear it out. Compressed air works pretty good for this.

Good Luck!

May 26, 2011 | 2001 Saturn SL

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I have a 2002 Toyota prius. I notice there is a pool of water on the passenger side floor after driving the vehicle with the ac on for a while. How can I fix this myself?

Hello, and welcome to FixYa. Please allow me to assist you.

Yes, you can do this yourself, and save yourself the costs of a technician doing it.

What you have is a clogged AC condensate drain hose.

When the AC is on, the AC system removes moisture form the air in the cabin, and drains this moisture out onto the road surface.

What you need to do:

Open the passenger side door, and have some towels and a small bucket ready. Pull back the carpet in the passenger side footwell, and, once the carpet is pulled back, you will be looking for a small black rubber hose that goes from the heater box, and pokes thru a rubber grommet in the firewall, towards the engine. Pull the rubber hose towards you, away from the firewall grommet, and see if the outer end is plugged up with mud. If so, insert a suitable thing, like a pencil, into the end to unclog it. Be prepared for about a quart of water to drain from the hose into your small bucket.

If the water does not drain from the open end, pull the hose off totally, from the bottom of the fitting on the heater box, and runs a coathanger thru it, to release the blockage, and then flush it out with water. Note that when you remove the rubber hose from the heater box fitting, water will drain out onto your carpet. This is where you need the towels.

I hope that this helps you out, ans saves you the 70 dollars most places would charge you to clean your drain hose.

If my assistance is useful, please consider leaving a 4-thumbs rating; I'd appreciate it greatly.

Thanks for choosing FixYa for assistance. Have a great day.

Jul 24, 2010 | 2002 Toyota Prius

2 Answers

AC is leaking water onto the floor on the passenger side, some said the drain line could be plugged?

Yes, the weep drain. Inside the engine compartment, on the firewall, passenger side, half way between top and bottom of firewall. Small rubber tube comes out, then does a 90* turn towards the ground then just stops. You can remove the weep drain and clean it, or use wire to "poke" around and break up the debris. I suggest removing it.

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My ac is leaking on the floor.

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.

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Wet spot on passenger floor board and its not antifreeze could it be condensate

sounds like it check the a/c fluid drain for any restriction, or leaks

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Did you have the windshield replaced recently? This is typically caused by faulty installation of a windshield. Sometimes it can be fixed by adding windshield sealant (polyurethene, not silicone) where the windshield is adhered to the subframe - most likely along the bottom edge.

Jun 28, 2009 | 2003 Dodge Dakota Club Cab

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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)

Jun 15, 2009 | 2003 Dodge Caravan

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Wet carpet under front Passenger seat

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.

Nov 19, 2008 | 2001 Volvo V70

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