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Unread 11-12-2006, 12:10 PM   #1
lma1973
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Clogged AC drain tube?

It sounds like there is a waterfall going on behind the passenger side of the dash. At first i thought it was just the coolant moving around in the coolant reservoir, but someone on here suggested a clogged drain tube. Here are the instructions i followed:

http://www.aircondition.com/tech/questions/4/__print

Well, i drilled the hole and nothing. No water at all. I got a coat hanger and ran about 10 inches of it through the hole to "unclog it" but still nothing.

What could the water sound be coming from and any ideas on how to fix it? Thanks in advance.

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Unread 11-12-2006, 03:46 PM   #2
zaq123
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Do you hear it with AC or heat on? Maybe it's your heater core or the evaporator?
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Unread 11-13-2006, 11:01 AM   #3
lma1973
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I usually hear it when i take off from a stop...like water sloshing around...doesnt matter if AC or heat is on. Also doesnt do it when driving down the road.
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Unread 11-13-2006, 05:56 PM   #4
lma1973
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Back to tha top
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Unread 11-13-2006, 06:03 PM   #5
zaq123
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Try to have somebody rock your jeep while you're looking under the hood/dashboard area. That's how I pinpointed a few noises that drove me crazy on the trail
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Unread 11-13-2006, 11:18 PM   #6
sgarlic
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Yeah, chances are you've got a ton of water sitting in there. I had that too, and drilling the hole didn't help. It's clogged up above the hole, probably not straight out like most people fish the coat hangar around in. That TSB is sort of misleading. What gets clogged is the drain passageway, not the hole leading to the outside of the vehicle.

You have to bend a coathangar and run it all the way up to the HVAC case, which is about a foot up. You also need to really move it around in there, because the "tube" is actually a passageway that's about 1 1/2 inch around. Once you hit the real clog, water will come pouring out of there. It might help to have the A/C running while you do this, because the air moving past the core will help push the water downward toward the tube.

Another guy here, and myself, ran secondary drain tubes from this hole to the floorboard on the passenger side, as a backup in case the actual hole itself gets plugged.
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Unread 11-14-2006, 07:36 AM   #7
lma1973
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Thanks for the replies. I'll try running a hanger way up there and see if that'll do it. It does sound like a ton of water in there!!
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Unread 11-20-2006, 06:20 PM   #8
lma1973
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Well i ran the coat hanger up their prob a good 18 inches or so and nothing. Still sounds like a ton of water in there. If im idling in neutral, i can stomp the gas and it will make the water move in there. Ive got gallons it sounds like!
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Unread 11-20-2006, 06:48 PM   #9
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I know the weather isnt great for this. But did you try to turn the AC on and see if you get anything from the drainage tube? If so you can rule out it being clogged.
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Unread 11-20-2006, 06:56 PM   #10
sgarlic
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I'm telling you, mine made that exact same noise before I replaced it. Same sound, did it with rev's, etc.
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Unread 11-22-2006, 10:13 AM   #11
lma1973
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Yeah i was running the AC at the time i was taking the coat hanger and trying to unclog it. It must be clogged so high up that i cant even get to it with a hanger. My question is why cant i get to the opening under the hood? If debris was able to find its way in there and it appears to be clogged very high up, cant i just follow the same path the debris took to get in there?
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Unread 11-25-2006, 02:49 PM   #12
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THis is the thread i've been looking for....i tried running the hanger....no water coming out, but seems to be less noisey. We'll see when i take it jeep out again.
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Unread 11-25-2006, 05:48 PM   #13
lma1973
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Ive tried everyting i can think of and ive still got a ton of water up there...oh well, its just gonna have to stay that way!
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Unread 11-26-2006, 12:03 PM   #14
sgarlic
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Have you been adding stop leak or regular refrigerant refill cans with oil included? If so, you also probably have a ton of that liquid inside the evaporator.
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Unread 11-26-2006, 05:32 PM   #15
lma1973
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Yes i did charge my AC early this summer and it was with a refrigerant can with oil added. To be honest, im not sure if i had the "water sound" before that?
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