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Old 12-05-2012, 08:39 PM
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Trans Cooler Lines

Hey Everyone,
I have a quick question I was hoping someone could help with. I have an 06 Grand Cherokee Overland with the 5.7 and tow package. My trans cooler lines were leaking at the metal compression fittings. Tonight I cut the fittings off and removed the hoses to replace them with 3/8" fuel line and hose clamps.
In the excitement of successfully cutting of the metal fittings I lost track of which hose went where. I took the best guess I could going off of pictures online and buttoned it all back up. No more leaks yet.
After starting the jeep and letting it run for a minute or so the fan kicked into super high gear! It sounded faster and louder than I've ever heard. I didn't get a check engine light or trans temp message. Could it be that I mixed the lines up and the Jeep thinks the trans is overheating?

I know that the line that comes out of the top of the transmission is currently connected to the line that is in the top position at the radiator...is this correct? Obviously the line that comes out of the transmission on the lower side is currently going to the bottom position at the radiator connection. Does anyone know if this is correct/incorrect?

Thanks in advance,
James
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Old 12-05-2012, 09:56 PM
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Re: Trans Cooler Lines

Oh man...I just remembered that I disconnected a plug near the top connector by the radiator and never plugged it back in! That's probably why my fan was going crazy!

I will plug it back in tomorrow morning and see if that cures the problem.
Does anyone know if the cooling lines have to be in a certain order?
Thanks
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Old 12-05-2012, 11:34 PM
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Re: Trans Cooler Lines

I just had mine replaced, the shop had another wk in where the lines burst and ruined the tranny.
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Old 12-06-2012, 07:21 AM
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Re: Trans Cooler Lines

Wow, they burst? I didn't think they were high pressure. Any input on operating pressure or which line is feed and which is return?
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Old 12-06-2012, 04:58 PM
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Re: Trans Cooler Lines

Does it particularly matter, if i had to guess the output from the tranny should go into the top and the return back to the tranny at the bottom? but dont take my word for it.
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Old 12-06-2012, 10:30 PM
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Re: Trans Cooler Lines

Does anyone know what the stock setup is?
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Old 12-06-2012, 10:40 PM
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Re: Trans Cooler Lines

Ive been looking through the service manual for a good 15 minutes it does not say which one connects where, all i got out of it was this:

CAUTION: The tangs on the hose clamps must be positioned straight down.
3. Install coolant reserve/overflow tank hose at radiator.
4. Connect both transmission cooler lines at the radiator.
5. Install both radiator mounting bolts.
6. Install air inlet duct at grill.


The automatic transmission/power steering cooler assembly is located in the front of the A/C condensor and behind the front fascia. The transmission cooler is a heat exchanger that allows heat in the transmission flud to be trans- ferred to the air passing over the cooler fins.
The transmission oil/power steering cooler assemblly is equipped with quick connect fitting for the transmission oil and power steering lines.
The transmission oil/power steering cooler is serviced as an assembly.
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Old 12-06-2012, 10:59 PM
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Can't find any info about it in the service manual. However, I know for certain that on my WJ it went FROM the trans into the TOP of the cooler. Bottom of the cooler supplies fluid TO the trans.
The idea is that the fluid cools better flowing down through the cooler as heat will have a tendency to stay higher in the cooler.
Honestly I doubt it makes much difference.....if any.
Doug


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Old 12-06-2012, 11:29 PM
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Re: Trans Cooler Lines

Interesting, thanks for the input.
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Old 01-13-2013, 07:42 PM
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Re: Trans Cooler Lines

I would NOT use fuel injection hose for this, it will leak again. There is atf specific hose you want to use. As mentioned about the burst hose, its a gamble to do this repair because if the hose does come off your in big trouble. It wont specifically mean dead transmission but it will mean the jeep isnt going anywhere and there will be atf EVERYWHERE.
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Old 01-13-2013, 11:40 PM
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Quote:
Originally Posted by 2005JGC View Post
I would NOT use fuel injection hose for this, it will leak again. There is atf specific hose you want to use. As mentioned about the burst hose, its a gamble to do this repair because if the hose does come off your in big trouble. It wont specifically mean dead transmission but it will mean the jeep isnt going anywhere and there will be atf EVERYWHERE.
Agreed! I made that mistake on my WJ with the first external cooler I did. Got around 20-25k miles and split a line.
Nothing like doing a highway roadside trans line repair laying in and covered in ATF....


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Old 01-14-2013, 08:12 AM
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Re: Trans Cooler Lines

Does anyone know what pressure the fluid is in these lines? I can understand the rubber corroding from the fluid, not sure about the fuel line resistance to ATF. What I can't imaging is the hose splitting or bursting. It is the same thickness as the original, is internally braided for reinforcement and was not nicked or damaged during install.
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