Thread: Transmission cooler lines

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  1. #1 Transmission cooler lines 
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    Hey I have a 97 GTP and i cant remember which line from the trans goes to which line on the radiator. I disconnected them at the rubber hoes. i just dont want to mix them up and have problems.
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  2. #2 Re: Transmission cooler lines 
    GTX Level Member OH4CompG's Avatar
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    I know which one feeds on the trans. The feed is the one the has the u-bend dip in it and the strait one is the return.
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  3. #3 Re: Transmission cooler lines 
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    OKay so hook the feed on the tranny to the exit on the radiator
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  4. #4 Re: Transmission cooler lines 
    GXP Level Member Zef_66's Avatar
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    From this thread, which is stickied at the top of this section:

    http://www.grandprixforums.net/trann...ion-10095.html

    Heres the low-down on cooler line fitting thread sizes.....

    97-Most 99s:

    Cooler FEED fitting (points straigth down) 1/4-18 NPSF, NO CHECKBALL
    Cooler RETURN fitting ( Horizontal-points towards front of car) 1/4-18 NPSF


    Some 99s, all 00-early 04s:

    Cooler FEED fitting (points straigth down) 3/8-18 NPSF, HAS CHECKBALL
    Cooler RETURN fitting ( Horizontal-points towards front of car) 1/4-18 NPSF


    Early 04 to current:

    Cooler FEED fitting (points straigth down) 9/16-18 UNF, NO CHECKBALL
    Cooler RETURN fitting (Horizontal-points towards front of car) 9/16-18 UNF
    2001 GSE
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  5. #5 Re: Transmission cooler lines 
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    thanks for your help guys
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  6. #6 Re: Transmission cooler lines 
    Turbo is the way to go. BillBoost37's Avatar
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    I think it feeds the top. that way if you are low on fluid..it falls to the bottom and you don't run dry
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  7. #7 Re: Transmission cooler lines 
    GXP Level Member Zef_66's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    I think it feeds the top. that way if you are low on fluid..it falls to the bottom and you don't run dry
    I always thought it was the other way around. I thought they fed the bottom of the radiator and return out the top?

    Can anyone confirm this? I'm not sitting at my car.

    Edit: I searched and found my answer:

    http://www.grandprixforums.net/trann...ler-32531.html

    The fitting on the transmission that points straight down towards the ground is the feed fitting that sends fluid to the radiator transmission cooler, which should be going to the bottom fitting on the radiator.

    The fitting on the transmission case that is parallel with the lower pan and points straight forward is the return fitting from the radiator and should be connected to the line going to the top fitting on the radiator.
    2001 GSE
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  8. #8 Re: Transmission cooler lines 
    Turbo is the way to go. BillBoost37's Avatar
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    Ya know..maybe it's like that to keep from having air issues because it's the highest point w/o a bleeder.

    Coolant you always see the feed going to top of the radiator and return coming out the bottom.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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