AC drain continues flood passenger side. - JeepForum.com
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post #1 of 9 Old 08-17-2017, 10:25 PM Thread Starter
1996jz
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AC drain continues flood passenger side.

Over the span of a few weeks I have had the drain line leak or back up issue. I have tried the hanger clean out method and the compressed air. Even went a bit further to get a pipe cleaner just for the job. Still getting water on the floor board though. I have a good strong plug in the hole I drilled so it's not that. I know it's not a rain leak (hasn't rained in around a week, carpet is soaked) is there anything I can do to fix this awful design flaw? Will re routing it fix it?

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post #2 of 9 Old 08-17-2017, 11:15 PM
Uniblurb
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I have the same 96 4.0 you do. When my AC drain was clogged I could take a small stiff wire with small hook on the end and pull tree crap/pine needles out of the drilled hole to the inside.

I'd watch blowing high pressure though the drilled hole since my styrofoam cradle the evaporator sits in was already crumbling to pieces. And chunks of it can definitely clog the drain. Plus high pressure may blow any tree crap/debris further up in the box.

I have heard you can remove the blower motor and reach up in there for cleaning stuff out of the box but have never tried it.

Sounds like a good idea if you have one of those small coiled spring snakes for cleaning pipes/drains to run through the AC drain. Can you hear or feel it go clear into the frame?

If your foam seal between box and firewall around the drain tube is bad water dripping out can blow right back into the cab following the drain while driving. And sealing using RTV up between box and inside firewall around the drain mainly fails.

While some may cut open the frame in the wheel well for putting an elbow on the drain pointed down I took it a step further. Below is the write-up I did for re-routing the drain tube completely out of the frame through the wheel well area.

http://www.jeepforum.com/forum/f13/a...te-up-3412082/

Plus in living in the woods I was tired of all the tree crap ending up in the box along with pollen, fine seeds, etc, which clogs the evaporator. Below is another write-up I did for installing the WJ cabin air filter/housing on my ZJ.

http://www.jeepforum.com/forum/f13/z...te-up-3927817/

Hope you figure it out and good luck.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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post #3 of 9 Old 08-18-2017, 09:34 AM
Mel63
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I used Uniblurbs write up about cutting a hole in the frame and so far my carpet is dry..

and a big thank you Uniblurb for doing the write up.

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post #4 of 9 Old 08-18-2017, 10:20 AM
Uniblurb
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You're welcome Mel. Thanks for the photo, glad the write-up worked out for you, and looking good!
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96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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post #5 of 9 Old 08-18-2017, 10:37 AM Thread Starter
1996jz
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Thanks for the info guys. Got off early today, time to go home and fix this mess.

Sent from my Nexus 6 using Tapatalk
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post #6 of 9 Old 08-18-2017, 11:43 AM
wingless
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Another option is to loosen the four nuts retaining the HVAC box to the firewall, from within the engine compartment, pull the bottom of the box away from the footwell, then use RTV in that gap to seal the drain area from the passenger compartment. Tighten the four nuts.


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post #7 of 9 Old 08-18-2017, 11:45 AM
Mel63
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Since I'm a landscaper I found that one of these drip tubing fittings fit perfectly on the drain hose along with some silicone and then a swing pipe fitting coming out of the frame along with a short piece of tubing.

https://www.ewingirrigation.com/710c...xc-comp-90-ell
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post #8 of 9 Old 08-18-2017, 02:43 PM
Uniblurb
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Nothin' like using what's available and thanks for the link. Figures since the OD of that fitting is for .710 drip tube and the ID must be a little smaller to fit the 5/8" (.624") OD of the AC drain tube.

I did all the irrigation work at my daughter's place in SoCal with her help. Just lovely all the ditches I dug in the sandy soil were full of big snails in the morning! Lol.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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post #9 of 9 Old 08-18-2017, 10:29 PM
papitt
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Garage
I too needs to do this repair. & I believe both of mine are draining into the floor.
... I saw this write up back years ago But I sold that ZJ ... But now after I got these 2 ZJ'S NOW I need this repair more than ever.
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