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Old 01-07-2016, 03:11 PM
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Unhappy Transmission Cooler Line - 1 simple question

Ok....I think I have most of this figured out but I have one remaining question that will likely mean the difference between fixing the issue myself and paying to have someone else fix the issue.

While putting a spring leveling kit, new shocks and new tires on my 2011 JKU sport recently, I noticed some red-ish fluid leaking from the rubber section of one of two mostly metal lines coming out of the bottom of my radiator. Upon further forum research, I found that these two lines are the send and return from the transmission to the transmission cooler and that the red-ish fluid must be tranny fluid. It appears that the leak is coming from the ~4" rubber section crimped between the remaining metal line.

After a call to the stealership, it looks like the want $130 for the part and 1.5 hours of labor to REPLACE THE ENTIRE unit - which includes both full send/return lines all the way from the tranny to the cooler and back.

Question: Given that the leak is in the rubber section of one line, is it possible for me to remove the rubber hose section and the crimps, clean the metal line tips and replace the rubber section with some 400psi tranny cooler line from NAPA and some hose clamps?

Some have noted that the system is pressurized - does that mean that there is something additional I would need to do after topping off the transmission fluid after replacing the hose or does the system pressurize itself? This is the difference between fixing it myself and having the stealership do it.

ANY HELP IS GREATLY APPRECIATED. Through this wonderful forum, I've also found out that this was covered by an extended factory warranty (up to 70K) for 08-10 JKs...of course, 2011 would be the only 3.8L V6 yr that it wasn't covered....MY LUCK SUCKS.

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Old 01-07-2016, 03:19 PM   #2
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Depending on how much pressure is in the line it is very possible hose clamps will not be strong enough to hold it long term. Otherwise the answer is basically yes, you can change it. Pressure is built by the pump in the transmission while it is running, there won't be any pressure when it is off.

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Old 01-07-2016, 04:00 PM
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Originally Posted by Potatohead View Post
Depending on how much pressure is in the line it is very possible hose clamps will not be strong enough to hold it long term. Otherwise the answer is basically yes, you can change it. Pressure is built by the pump in the transmission while it is running, there won't be any pressure when it is off.
Thanks Potatohead - based on the look of the crimp connections that are on there now and how many reports there are of leaks, I cant imagine at they are any stronger or secure than a well tightened hose clamp. Thanks for the input!
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Old 01-07-2016, 04:37 PM   #4
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Like Potatohead is saying YES you can and it is a simple job that can save you the monny. Take the original line and go to a specialized store and build in a new one resist against higher pressure.
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Old 01-07-2016, 05:10 PM   #5
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Cut the tubing on each side of the hoses, replace with the compression fittings and hose barbs then install the braided hose with clamps.
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