2010 Jeep Grand Cherokee Transmission Cooler Line Diagram
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Discussion Starter · #1 ·
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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Discussion Starter · #2 ·
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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I just had mine replaced, the shop had another wk in where the lines burst and ruined the tranny.
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Discussion Starter · #4 ·
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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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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Discussion Starter · #6 ·
Does anyone know what the stock setup is?
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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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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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Discussion Starter · #9 ·
Interesting, thanks for the input.
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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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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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Discussion Starter · #12 ·
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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I think it has more to do with temps and chemical resistance. Good fuel injection hose is good for at best 300 degrees, some are even less. Common for trans temps from the trans to the cooler to be well into the 200's so long term exposure plays a part. It works for awhile, but the lines get brittle and break down over time.
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I dont mean it may burst, I just brought up the aforementioned story about a line bursting and destroying the tranny. But what can and will happen is the rubber will get soft and may allow the hose to slip off the hard lines.
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Understood. It's all good info and food for thought if nothing else.
When my ATF was blowing out of the line the trans wouldn't stay in gear. It would drop out of gear assuming from lack of fluid/pressure.....that and the big smoke cloud behind me from it being all over the exhaust....haha
Not a fun day...
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I did this "mod" the 3/8" fuel line will hold the pressure no problem. I even left alitte extra hose and and put two clamps on each end. ATF fluid is an oil in a sense and has less corrosive properties then gas. I would just keep an eye on it which i do almost weekly cause im always paranoid but I havent seen a problem yet.
To me I would rather save the money and do this mod ten times over before ever replacing the whole line for over 100 bucks. Which will leak again within time.
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I did this "mod" the 3/8" fuel line will hold the pressure no problem. I even left alitte extra hose and and put two clamps on each end. ATF fluid is an oil in a sense and has less corrosive properties then gas. I would just keep an eye on it which i do almost weekly cause im always paranoid but I havent seen a problem yet.
To me I would rather save the money and do this mod ten times over before ever replacing the whole line for over 100 bucks. Which will leak again within time.
It will work for awhile. ATF WILL kill fuel line. It makes it hard and brittle. Probably more due to the fluid temp changes than anything else. Keep an eye on it for sure
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i just had mine replaced. $65 in labor, $60.88 for the trans lines and $12.88 for trans fluid
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Not saying it is a permanent fix!!!
But with the "modified" way it is a twenty minute fix for about $5-10 bucks. Versus repurchasing a part for much more that is known to fail. Just my two cents. This is more cost effective for me versus a full replace.
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Hi, I just went to the dealership and they quoted me 700$ to change the tranny cooler lines because of a leak... If I go to my cousin who has his own garage what exactly should I tell him? What do you guys suggest he does? Thanks
PS> Is this a good fix? "the cheaper way to go is cut the line up by the radiator with a tubing cutter and on the transmission. leave about a inch of line left by the radiator and the transmission. get some 3/8 gas hose and 2 small screw clamps. rubber will be cheaper then metal. if you use metal you will have to use your fittings and flare both ends on the line."
Someone said "you can get complete lines from the dealer these lines really can't be mickey moused and are relatively cheap from the dealer"
Question is, if I buy the lines from the dealer, which I dont mind paying, it's around 50-70$... is that a good idea or?
Posted by: kiaramoorefielde0198847.blogspot.com
Source: https://www.jeepgarage.org/threads/trans-cooler-lines.51196/
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