YJ evaporator core replacement steps - JeepForum.com
 
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post #1 of 9 Old 07-20-2019, 02:22 PM Thread Starter
Fishstic
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YJ evaporator core replacement steps

Got a leak that I think is coming from the Evap core, also planning on replacing the heater core (not now though) what're the steps/can I get a write up am I going to have to remove the dash? I'm ready to do it (unwillingly)

For some context, every now and then water leaks from the metal pipe that comes out of the fire wall on the passenger side, gets all over passengers feet. Thinking it's a clog in the evaporator core drain, or maybe it's icing really bad.

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post #2 of 9 Old 07-20-2019, 02:45 PM Thread Starter
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Just read the service manual, apparently if I have a condensation leak inside the cabin I should flush/clean out it's drain hose, I'm guessing the one connected to the drier? Unless it uses the same tubing as the heater core? Anyone know how to flush the drain?

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post #3 of 9 Old 07-20-2019, 02:46 PM Thread Starter
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Leave this here if anyone needs it

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post #4 of 9 Old 07-20-2019, 06:58 PM
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To the best of my knowledge, you'll have to remove the unit from under the dash. Not the dash itself. You might be able to do it without removing the hoses, but getting inside the evaporator is tedious. Mine is completely out of the Jeep right now for a new switch.

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post #5 of 9 Old 07-21-2019, 03:59 PM
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Here are some pics that might help you.
20190721_173315.jpg

This is what you would see on the top and backside of the AC unit on the drivers side.

20190721_173319.jpg

This would be the passenger side

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #6 of 9 Old 07-21-2019, 04:10 PM
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A picture of the drain that should face the fire wall and be near the center of the vehicle.

20190721_173517.jpg

20190721_173508.jpg

In this picture you can see the distance that the lines travel outside of the case to the firewall. The fire wall mounting flange is to the lower left of the picture. The lines outside the case can sweat and drip also. Even the Jeep factory air is a standalone add on system. This is why it is designed like this but the exposed lines between the box and firewall and potential sweating of them is a downside.

The good news is that it really makes adding an AC system onto a YJ possible.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #7 of 9 Old 07-21-2019, 06:21 PM Thread Starter
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Quote:
Originally Posted by Boojo35 View Post
A picture of the drain that should face the fire wall and be near the center of the vehicle.



Attachment 3844775



Attachment 3844777



In this picture you can see the distance that the lines travel outside of the case to the firewall. The fire wall mounting flange is to the lower left of the picture. The lines outside the case can sweat and drip also. Even the Jeep factory air is a standalone add on system. This is why it is designed like this but the exposed lines between the box and firewall and potential sweating of them is a downside.



The good news is that it really makes adding an AC system onto a YJ possible.
Used the 2nd picture to find out where the leak was coming from, went for a drive for 2 hours and saw the water coming out, I'm assuming this is connected to the drier? Maybe if I use some adhesive it'll fix it, but if it is a clog then It wouldn't be sorta pointless.

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post #8 of 9 Old 07-21-2019, 06:36 PM
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Attachment 3844775

Really look at this pic here. If your AC is on, water needs to be able to exit this drain freely. So, if you disconnect it water will flow out pretty steady on a humid day, There is a rubber hose that should be connected to this drain that makes this water exit the interior of the vehicle. If this drain is plugged, water will build up in the housing and drip out places like shown in your picture. I guess to this point it has been unclear to you. check the drain.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #9 of 9 Old 07-21-2019, 07:54 PM
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I say it's a clogged drain line. Or you could of had my problem and had the hose kinked by the heater diverter. I found out by running the AC and taking a right turn and having water pour out of the small vent on the left.

Not sure if I will help but here is a thread I did on my AC refurbish.

https://www.jeepforum.com/forum/f12/...rbish-1010356/

Lou

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YJOTM February 2014


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