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Old 10-14-2011, 10:05 AM   #1
Ghill_Sl1
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Default Transmission Cooler Lines: Where to buy

The time has come to replace my radiator which has the classic crack in the plastic tank.

Normally I am good at finding things on the internet but cannot find anywhere to buy the replacement upper and lower transmission cooler lines.

The connections are severly corroded and I highly doubt I could remove and reuse my lines at all.

Any advice?!

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Old 10-14-2011, 10:45 AM   #2
OldNuc
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Default Re: Transmission Cooler Lines: Where to buy

RockAuto, http://www.rockauto.com One is listed under Automatic Transmission, components and the other under oil cooler. 21031306 upper hose and 21031307 lower hose.

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Old 10-15-2011, 06:52 PM   #3
Baron5867
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Default Re: Transmission Cooler Lines: Where to buy

Quote:
Originally Posted by OldNuc View Post
RockAuto, http://www.rockauto.com One is listed under Automatic Transmission, components and the other under oil cooler. 21031306 upper hose and 21031307 lower hose.
THANKS! I should replace my radiator soon, it is nice to know that I can get these from RA. I looked, but I thought that they would be in their own category. I guess it helps to know the part #s.

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Old 10-18-2011, 10:16 PM   #4
steveo236
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Default Re: Transmission Cooler Lines: Where to buy

The cooler lines were also available (and in stock) at my local GM dealer for about $20 (each). I just did a radiator replacement on my '98 SL2. Top cooler line came off without much problem. The lower did not.

Couldn't find them at any local auto parts place (Napa, Advance Auto, etc.)

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Old 10-19-2011, 08:37 PM   #5
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Default Re: Transmission Cooler Lines: Where to buy

What about junkyard lines? I've got some that I keep around, but are they recommended to re-use?

shawn

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Old 10-19-2011, 08:52 PM   #6
OldNuc
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Default Re: Transmission Cooler Lines: Where to buy

If they are clean inside and in good physical condition.

They are both available from RockAuto.

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Old 10-20-2011, 05:26 PM   #7
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Default Re: Transmission Cooler Lines: Where to buy

i think online dealers still stock ... think have to lookup under cooling , not tranny.

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Old 10-23-2011, 08:30 PM   #8
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Default Re: Transmission Cooler Lines: Where to buy

Quote:
Originally Posted by OldNuc View Post
RockAuto, http://www.rockauto.com One is listed under Automatic Transmission, components and the other under oil cooler. 21031306 upper hose and 21031307 lower hose.
Somebody enlighten me on these lines... is the issue that the nuts are in super tight, and they get rounded off, or something else?

Is there a way I can attempt to check for removal of these lines while they (and the radiator) are in the car without damaging anything, so that I can decide if I need to have these lines on hand? Or with a '94/165k miles, should I just replace them no matter what? Thanks.

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Old 10-23-2011, 09:05 PM   #9
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Default Re: Transmission Cooler Lines: Where to buy

They are a JIC or AN fitting and by design are a leak tight metal to metal seal. Removal is aways difficult and when the fitting nut is made from a soft material and the opposite end is set into plastic failure is almost assured. An in vehicle removal attempt is likely to not prove productive.

If you have new lines available the old ones will remove easily but if you do not they will be destroyed in the removal process. It is the first law of the perversity of inanimate objects.

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Old 10-23-2011, 11:33 PM   #10
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Default Re: Transmission Cooler Lines: Where to buy

The crimps on the transmission cooler lines also loosen over time and leak automatic transmission fluid. You could screw on hose clamps over the crimps to make them last longer. My replacement transmission cooler lines from the junk yard are leaking already. Luckily, I have a new set of cooler lines. I'm thinking of using Barnowl's procedure of extracting the metal pieces at both ends of the return line closest to the transmission filter to use as part of an external transmission cooler.

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Old 10-24-2011, 08:20 AM   #11
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Default Re: Transmission Cooler Lines: Where to buy

Thanks Old Nuc, edlee.
Quote:
Originally Posted by OldNuc View Post
If you have new lines available the old ones will remove easily but if you do not they will be destroyed in the removal process. It is the first law of the perversity of inanimate objects.
I think I am going to have new ones on hand, at the relatively low cost of inbound and outbound shipping if I don't need them.

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Old 10-24-2011, 08:38 AM   #12
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Default Re: Transmission Cooler Lines: Where to buy

Quote:
Originally Posted by edlee View Post
The crimps on the transmission cooler lines also loosen over time and leak automatic transmission fluid. You could screw on hose clamps over the crimps to make them last longer. My replacement transmission cooler lines from the junk yard are leaking already. Luckily, I have a new set of cooler lines. I'm thinking of using Barnowl's procedure of extracting the metal pieces at both ends of the return line closest to the transmission filter to use as part of an external transmission cooler.
If you install a cooler you want one with a temp controlled internal bypass as the transmission does not tolerate low temperature. 120-140 for the bypass.

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Old 12-16-2011, 07:21 AM   #13
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Default Re: Transmission Cooler Lines: Where to buy

Quote:
Originally Posted by Baron5867 View Post
Thanks Old Nuc, edlee.
I think I am going to have new ones on hand, at the relatively low cost of inbound and outbound shipping if I don't need them.
I ordered in both trans cooler lines from RockAuto. Both lines were in very tight at the radiator, but I used PB BLaster (don't know if it mattered), clamped on vise grips as hard as I could, and then used quite a bit of force to unscrew the lines. On the lower trans cooler line, the fitting was stuck fast to the metal tubing, so that the tubing turned with the fitting and kinked. I replaced the lower trans line only.

Note/PSA/Warning: the trans cooler lines do NOT come with the plastic disconnect fitting for the transmission side of the lines (). You need to buy those separately, Dorman part 800005. RockAuto does carry this cheaply, but it might well ship from a different location than the cooler lines or anything else you order in, which might make them overly expensive with the added shipping. Your FLAPS might have them as well, in my area Advance Auto and Pep Boys carried them.

Big thanks to edlee for calling out the Dorman part in a post elsewhere, it saved my butt.

Last edited by Baron5867; 12-16-2011 at 07:28 AM..

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