Thread: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line

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  1. #1 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    SE Level Member sschwaeble93's Avatar
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    I would like to install a trans cooler on my 2006 Pontiac Gxp and I need to know which trans cooler line is the return. Is it the one at the top of the radiator or the bottom? Also where is the best spot to cut the return line to add in the aftermarket trans cooler? Any help would be greatly appreciated. Thanks guys.
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  2. #2 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    I live here. DirtDog's Avatar
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    Its the line that comes out of the bottom. I would completely bypass the radiator for best results...I'm gonna redo mine to bypass radiator. But if u don't wanna just cut the line in the area that isnt metal...near bottom of rad.
    http://www.grandprixforums.net/my-06-gp-gxp-72403.html
    OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>

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  3. #3 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    GXP Level Member 91parkave's Avatar
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    Follow the lines out the trans the horizontal metal line is the return the one that goes down is pressure. People say gm pit the lines for the return on top and pressure on bottom various reasons but I disagree completely with that. I run mine pressure side on top return on bottom.
    Anyway you'll need to do some googleing for best location I had mine behind the DRL light hole forever but recently moved it into the front bumper area. Of course I had to take off the bumper though but its actually pretty easy to do.
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  4. #4 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    SE Level Member sschwaeble93's Avatar
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    Thank you so much for your help. So return line comes straight out of the trans then and hooks into the top or bottom of the radiator? Also where should I cut into the return line. I saw a writeup with pictures from bluestreak but it did not really show where to cut the return line to hook in the cooler. Thanks for the info 91ParkAve.
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  5. #5 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Ok so you said the return line is definitely the bottom line coming out of the radiator? Also should I just cut the rubber hose part of the return line in order to splice in the cooler? Thanks for your help.
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  6. #6 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    I live here. DirtDog's Avatar
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    Yea cut the rubberish area
    http://www.grandprixforums.net/my-06-gp-gxp-72403.html
    OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>

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  7. #7 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    GXP Level Member 91parkave's Avatar
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    Like marines said cut the rubber use barbed fittings Autozone sells air tool line repair/splice fittings use use those and double clamp with fuel injection line clamps those are some of the best to use imo and BTW its best to do this when your doing a pan drop filter replace
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  8. #8 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Great thanks again. I ordered the Hayden 1404 cooler of ebay. Is there anything else I need to complete the installation? I wanna get this right the first time it's my daily driver now. LOL
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  9. #9 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Your the best. Thanks and have a goodnight. I will let you know how I make out on the install and I will try to take some pics.
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  10. #10 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    One last thing what size are the barbed fittings?
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  11. #11 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    3/8
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  12. #12 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Thanks again for all of your help 91parkave and marines542. Talk to you soon.
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  13. #13 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Can someone please tell me how to replace the transmission cooler lines on a 2006 Pontiac Grand Prix Gxp??? I would like to put new cooler lines on the car before I add the trans cooler as the original lines are leaking. Thank you.
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  14. #14 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
    GXP Level Member 91parkave's Avatar
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    Where are they leaking and if they are just cut both and run them to your New cooler problem solved
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  15. #15 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    They look to be leaking on the steel part of the line. I just want to replace them because I already purchased both of them today form the dealer. Is there a snap ring to release the old lines??
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  16. #16 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Think about this you're going to install a trans cooler so regardless you're gonna cut or modify the lines take the ones you bought back and get it over with already
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  17. #17 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Ok I will do that. But can u please tell me how to release the lines from the fittings. I can't seem to pop the clip loose. Thanks park ave.
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  18. #18 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Can someone please tell me how to release the transmission cooler lines for the radiator fittings. I got the car up up in the air and this is pissing me off. Any help would be greatly appreciated. Thank you very much.
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  19. #19 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Take a small flat head screw driver or a pick and pop the little snap ring off
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  20. #20 Re: 2006 Pontiac Grand Prix Gxp Transmissoin Cooler Return Line 
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    Thanks for all your help guys. I added a Hayden 1404 transmission cooler to the car and all is well so far. Hope it keeps my temps nice and cool. Car got up to 226F the first day I bought it. Now with the cooler the highest I have seen it is 190F.
    Thanks again and have a great night. I will try to post some pics later.
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