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 Post subject: 42RLE Cooling line I.D.
PostPosted: Mon May 09, 2016 12:41 pm 
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Hi Guys,

New to the forum. I recently picked up a 2011 Jeep Liberty Sport 4x4.

My question is regarding the transmission (42RLE) cooling lines. Does anyone know which line is the outlet and which is the return?

I would like to install an aux cooler and just want to make sure I have the lines right!

Thanks!


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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Tue May 10, 2016 1:54 am 
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That's a good question. My guess would be the one lower on the side of the trany would be return. But that would be a total guess. The SM does not show flow direction of the external trany cooler lines, and does not label them in the removal or installation instructions.

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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Tue May 10, 2016 8:39 am 
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Scar0 wrote:
That's a good question. My guess would be the one lower on the side of the trany would be return. But that would be a total guess. The SM does not show flow direction of the external trany cooler lines, and does not label them in the removal or installation instructions.


Here is a link I came across: http://www.jeepforum.com/forum/f9/42rle ... s-1262983/

Seems that he agrees with you!

EDIT: Please disregard the above link. Incorrect info there..... use this one instead: http://www.jeepforum.com/forum/f9/keep- ... ndex7.html


Last edited by 4500GUY on Tue May 17, 2016 12:44 pm, edited 1 time in total.

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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Tue May 10, 2016 11:52 pm 
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One main issue with an Aux cooler would be the OEM bypass valve. It cross connects the out line to the return line.
It remains closed(loops the flow back to the trany) until the trany fluid is up to operating temperature. Once the trany fluid is up to temp, it opens up(closes the loop back) to allow flow to-from the OEM cooler.
If you splice in the Aux cooler on the trany side of the bypass, it will take a long time to get up to operating temp., which will cause problems.
It would be best to splice in from the cooler lines at the Rad.

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07 KA Light Khaki, Manual trany.
2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Wed May 11, 2016 8:40 am 
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Scar0 wrote:
One main issue with an Aux cooler would be the OEM bypass valve. It cross connects the out line to the return line.
It remains closed(loops the flow back to the trany) until the trany fluid is up to operating temperature. Once the trany fluid is up to temp, it opens up(closes the loop back) to allow flow to-from the OEM cooler.
If you splice in the Aux cooler on the trany side of the bypass, it will take a long time to get up to operating temp., which will cause problems.
It would be best to splice in from the cooler lines at the Rad.


Scar,

That's good to know. Where exactly is the bypass valve located? The lines turn to rubber then back to steel before going into the factory cooler. I was thinking of splicing into the rubber line.

- Dave


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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Wed May 11, 2016 8:57 am 
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I don't have an automatic so I can't look for you on my rig.
The 2 steel lines come out of the drivers side of the cooler and then turn into rubber. Then back to steel. It is in this area it clamps across the two steel tubes vertically.
I believe it is on the right side of the engine?
#4 in this diagram.
Image

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2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Wed May 11, 2016 12:35 pm 
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Scar0 wrote:
I don't have an automatic so I can't look for you on my rig.
The 2 steel lines come out of the drivers side of the cooler and then turn into rubber. Then back to steel. It is in this area it clamps across the two steel tubes vertically.
I believe it is on the right side of the engine?
#4 in this diagram.
Image


Yes, that's it. Thanks for the diagram! I should be good if I tap into the rubber line, so I will be on the cooler side of the bypass valve.

All lines on my Liberty are on the drivers side.

Thanks again for the help!

- Dave


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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Wed May 11, 2016 2:05 pm 
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Glad to lend a hand when I can. 8)
Sounds like you have a good plan for the install. And thanks for telling me the tubing path.
Since I don't have an automatic, I wasn't sure which side of the engine it was routed. Now I know if the question comes up again. :D

Your next hurtle will be to figure out how much fluid you will need to add.
Rigs these days are not easy to DIY like they used to be.
You will need to monitor the actual fluid temp, via a scan tool, then using that temp, match the fluid level to the chart.

Once you get that covered, your golden. :BANANA:

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07 KA Light Khaki, Manual trany.
2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

Image


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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Wed May 11, 2016 3:16 pm 
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Scar0 wrote:
Glad to lend a hand when I can. 8)
Sounds like you have a good plan for the install. And thanks for telling me the tubing path.
Since I don't have an automatic, I wasn't sure which side of the engine it was routed. Now I know if the question comes up again. :D

Your next hurtle will be to figure out how much fluid you will need to add.
Rigs these days are not easy to DIY like they used to be.
You will need to monitor the actual fluid temp, via a scan tool, then using that temp, match the fluid level to the chart.

Once you get that covered, your golden. :BANANA:


You bet!

I have already been preparing for the fluid fill. I have a "dipstick", a chart and the scantool for the temps.

Thanks! :D

- Dave


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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Thu May 12, 2016 12:29 am 
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Well then, all that is left to say is...
Pics or it didn't happen! :-)r
Oh, and it would make a great addition to the Tech section if you have the time.

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07 KA Light Khaki, Manual trany.
2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Tue May 17, 2016 8:03 am 
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OK, so I learned a bit more about which line is hot (output). This thread cleared it up: http://www.jeepforum.com/forum/f9/keep- ... ndex7.html

I can verify this from my own experience on the 2011 Liberty with the 42RLE trans. The lower line is the hot (output) and the upper is the cool (return from cooler).

Auxiliary cooler and external filter installed and working well. :BANANA: Pics to follow....

Cheers!


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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Tue May 17, 2016 10:35 am 
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I added this thread to the how-to's index in the tech section. Lots of great information here! Pics would make it even better. :JEEPIN:

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 Post subject: Re: 42RLE Cooling line I.D.
PostPosted: Tue May 17, 2016 3:40 pm 
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4500GUY wrote:
OK, so I learned a bit more about which line is hot (output). This thread cleared it up: http://www.jeepforum.com/forum/f9/keep- ... ndex7.html

I can verify this from my own experience on the 2011 Liberty with the 42RLE trans. The lower line is the hot (output) and the upper is the cool (return from cooler).

Auxiliary cooler and external filter installed and working well. :BANANA: Pics to follow....

Cheers!

Way cool(pun intended) and good info. 8)

_________________
07 KA Light Khaki, Manual trany.
2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

Image


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