Thread: 2003 Grand Prix Trans Cooler Line Replacement

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  1. #1 2003 Grand Prix Trans Cooler Line Replacement 
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    I have a 2003 Grand Prix 3.8 (K vin, no super charger) when I was changing the trans filter and replacing the leaking pan gasket I noticed oil on the air deflector. After further inspection I notice that the lines running to the trans cooler are leaking where the steel meets the rubber. One is leaking rather badly not sure if the other is leaking. I plan on replacing both since I already have to fill the trans.

    My question is how do they connect to the trans and the cooler? It looks like they are just a hex nut with a flare or compression under it. Is that correct? Is there a trick to removing them? Anything else to watch out for while changing them?

    Thanks for your help!
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  2. #2 Re: 2003 Grand Prix Trans Cooler Line Replacement 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    On the cooler line, at the end where it either goes into the transmission or the radiator, is a small clip. Grab a small angle pick and remove it, and don't lose it or you'll have to go buy a new one. Inside the fitting is a rubber o-ring and the line just slides over that untill, then the clips holds it from coming out.


    They look like this.




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  3. #3 Re: 2003 Grand Prix Trans Cooler Line Replacement 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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  4. #4 Re: 2003 Grand Prix Trans Cooler Line Replacement 
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    Thanks for the pictures! Looks straight forward. Again thank you!
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  5. #5 Re: 2003 Grand Prix Trans Cooler Line Replacement 
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    Anyone know where I can get replacement clips? The ones I took off are "sprung" and I don't really want to use them.
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