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Old 01-08-2010, 08:29 AM   #1
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Auto Transmission oil cooler lines

My lines that go to my radiator is leaking some fluid. The radiator is new, but the lines look like the original lines. The OEM lines cost alot, so is there another solution to replacing them with aftermarket ones? Thanks.

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Old 01-08-2010, 11:09 AM   #2
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Get some made at Napa. I'm going to be doing the same soon. I've had a friend do this same thing. Niether of them are high pressure lines so making new ones is no issue, I've gotten this answer from both my mechanic friends and dealers. (Mine is a '97 and I'm not positive on the newer 4spd transmissions - might want to check on that first if you have the 4spd).

Take off the lines, cut just behind the crimp and take it down to Napa asking them to install some transmission fluid line in the length you need. They should be able to flare the ends, cut the line and then crimp it on. If Napa won't do it, take it to a tractor or hydraulic supply place.

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Old 01-08-2010, 11:43 AM   #3
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Hey thanks. I'll give it a shot!
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Old 01-08-2010, 11:53 AM   #4
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While your at it, might want to change the fluid since you might end up with some air in the lines.
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Old 01-08-2010, 12:19 PM   #5
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oil lines

mine was leaking cost 28 bucks at napa for the right fitting and hose no more leak dealer wanted 187.00 for the complete set..
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Old 01-08-2010, 12:45 PM   #6
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While your at it, might want to change the fluid since you might end up with some air in the lines.
I just replaced the oil and filter!!
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Old 03-19-2010, 11:51 AM   #7
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I am going to do the same thing on mine then, a 99 TJ. I was quoted $230 to change the entire line. I need to change the filter and gasket on the pan too. I have a pretty good drip from around there. I have not taken off the cover to see yet. If I just change the fluid that comes out with the pan will that be enough to remove the air that might get in? Anyone have a link for changing all of the fluid? Thanks.
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Old 03-19-2010, 02:06 PM   #8
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Exactly what is leaking? The lines themselves won't leak, but the fittings that hold them can. A leaking line like that doesn't often need to be replaced, just find what is leaking & fix that specific part. Maybe you just need to replace that short piece of rubber hose that goes between the hard line & the radiator fittings?
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Old 03-19-2010, 03:24 PM   #9
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Yes it is the short piece of rubber hose that is soaked in AT fluid. I took it to a local Jeep shop here and he said you can't just change the rubber you have to replace the entire line. He quoted $230 with parts and labor. From what I am reading here it is possible to just change the rubber part. Does this part look like it would be of any help?

AutoZone.com | Vehicle Selection | Year

or this?

1997-2001 Jeep Cherokee Lower Transmission Oil Line - Dorman
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Old 03-19-2010, 03:52 PM   #10
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Your Jeep shop is full of it. I replaced that short piece of hose for $3-4 and it took me 15-20 minutes from start to finish. In my garage, with no special tools other than a knife to cut the old hose off the hard line. I slipped the new piece of hydraulic transmission hose over the hard line, secured it with the same type of clamp that holds the other end of the hose to the radiator ports and that was that.
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Old 03-19-2010, 05:01 PM   #11
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Thanks Jerry for the info! I can see that the hose is held on with clamps on both sides. Looks easy enough. I heard the hose is difficult to get off where it meets the metal line. How much fluid comes out when you take it off? I was going to change my gasket and TF filter at the same time probably.
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Old 03-19-2010, 05:16 PM   #12
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Uh, the ATF is gonna gush out if you're not careful. So clamp the hose so the cooler doesn't drain, & cut it in half on the other side of the clamp (vise grip works fine). Then put your thumb over the hard line as much as you can while you slip the new line on & then quick pull the old hose off the radiator & slip the new one on. ATF is some pretty sick messy stuff, ya oughta see my garage floor (outdoor carpeting on it) from the several "accidents" I've had involving ATF.
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Old 03-11-2011, 05:20 PM   #13
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Hey Jerry, It's Jerry from FL. I have the same problem with a tranny hose leak on my 97 TJ. What would be the damage with just letting both drain empty so that I can remove hose and clamps to get the right replacement size(s)?
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Old 03-11-2011, 07:20 PM   #14
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Hmmm when I installed my temp sensor for my Trans temp gauge I cut the steel line that comes out right at the bottom of the radiator and only a few drips came out. Installed it checked the fluid level and it has been fine for the past 25,000 miles. I don't know why but fluid never gushed out. The cooler for the radiator is doing what it is supposed to.
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Old 03-11-2011, 07:33 PM   #15
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Hey Jerry, It's Jerry from FL. I have the same problem with a tranny hose leak on my 97 TJ. What would be the damage with just letting both drain empty so that I can remove hose and clamps to get the right replacement size(s)?
It wouldn't hurt a thing to do that. Buy the way, the factory constant-tension spring clips are better for those keeping those types of hoses leak free without damage than aftermarket worm-gear hose clamps are.
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Old 03-11-2011, 07:56 PM   #16
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Thanks for the info...it's gonna be a messy Sat. morning.
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Old 03-11-2011, 08:01 PM   #17
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Thanks for the info...it's gonna be a messy Sat. morning.
Yeah no matter how careful I try to be when I am doing anything to do with ATF, it turns into a mess. My garage came with indoor-outdoor carpeting on the garage floor and there's some real nice ATF stains on it from my various tranny/transfer case jobs/swaps.
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Old 08-22-2011, 06:12 PM   #18
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Any suggestions on what to use to cut the metal hard line? I'm replacing the radiator and the rubber hoses need replacing too but one of them is crimped on.
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Old 08-22-2011, 07:30 PM   #19
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I've had good results from using a Dremmel cutting wheel to cut my hard tranny lines.
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Old 08-22-2011, 07:52 PM   #20
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Or a regular old tubing cutter would work.
You can get a mini for less then 10 bucks.
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Old 08-22-2011, 09:58 PM   #21
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x2

x2 on the mini tubing cutter. Cheap and works on all sorts of lines making a nice, clean cut.
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Old 08-23-2011, 05:49 AM   #22
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Thanks! Sounds like a fun-filled Saturday!
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Old 08-23-2011, 05:13 PM   #23
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Teflon tape on the fitting before I screw them into the radiator? Not sure about tefon tape and high heat.

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