Leak near trans cooling line
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Leak near trans cooling line in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I already replaced my radiator about 45k mikes ago/2 yra ago(143k on car then) because of the famous radiator/trans cooling ...
  1. #1
    khpappas's Avatar
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    I already replaced my radiator about 45k mikes ago/2 yra ago(143k on car then) because of the famous radiator/trans cooling line issue. Now at 189k i noticed some wetness on the trans lines. Wonderig if just the lines are now bad and needing to be replaced. Anyone replace them themselves and how hard of a job is it. Hope not another rad. Drives fine and no leaks on floor when parked. Im going to take off the plastic undercarraige pan this weekend to get a better look from bottom.

    20130213_220546-1.jpg



    20130213_220147-1.jpg



    20130214_184710-1.jpg

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    david780a is offline Cadillac Owners Member
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    Re: Leak near trans cooling line

    mine did the same thing and i ignored it like a fool, then about 3 weeks after i noticed the wetness the coolant overflow filled with strawberry milkshake, tranny fluid and the transmission was filled with coolant, dont ignore it , its giving you a warning.

  4. #3
    khpappas's Avatar
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    I dont think its the radiator but rather the trans line leaking at those metal fittings on the line itself in the middle of the line where there is a crimp type fitting. Updates with pics tomorrow...

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    Argent1's Avatar
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    Re: Leak near trans cooling line

    edited due to myopia..................lol

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    talladega's Avatar
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    Re: Leak near trans cooling line

    When you replaced the rad you didn't go with an external transmission oil cooler?

  7. #6
    khpappas's Avatar
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    No. Kept things stock. I dont drive nearly as much as i did (88 miles a day) so i wont be racking up the miles again. I comfirmed last night when i took off the plastic under pan that the lines are leaking were the metal line crimps to the rubber part. You cant see in this pic but those metal on the right are dry but towards the left there are those fittings again and they are soaked. Ordered the parts online.

    And good thing i investigated because whoever replaced my rad forgot to secure the two bottom condenser fasteners, so the condenser is loose and hinges from the top and flops back and forth...

    20130213_220147-1.jpg

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    Re: Leak near trans cooling line

    Quote Originally Posted by talladega View Post
    When you replaced the rad you didn't go with an external transmission oil cooler?
    This. This is what I'd go with now. I'd seal both those up and run an external cooler. Its just a matter of time before those lines pop. Its well documented.

    Quote Originally Posted by khpappas View Post
    No. Kept things stock. I dont drive nearly as much as i did (88 miles a day) so i wont be racking up the miles again. I comfirmed last night when i took off the plastic under pan that the lines are leaking were the metal line crimps to the rubber part. You cant see in this pic but those metal on the right are dry but towards the left there are those fittings again and they are soaked. Ordered the parts online.

    And good thing i investigated because whoever replaced my rad forgot to secure the two bottom condenser fasteners, so the condenser is loose and hinges from the top and flops back and forth...

    Attachment 103955
    I'd look into an external trans cooler and run the lines into that, and seal up the rest of that up with the bolts and some JB weld.

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    Re: Leak near trans cooling line

    Quote Originally Posted by odthetruth View Post
    This. This is what I'd go with now. I'd seal both those up and run an external cooler. Its just a matter of time before those lines pop. Its well documented.
    i really wish cadillac would have done something about this issue.
    and we have cadillac customer service on here now and they dodge every thread that they know they should have issued a recall for.....

    mine blew off on the highway, i got stuck in a construction zone where there was barely any shoulder to park on, the tow truck driver almost got hit while putting the dollys on.
    IMO - DESIGN FAIL Award goes to.... CADILLAC!!!

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    khpappas's Avatar
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    Its not the radiator or where they conncet to the rad this time (remember my rad was replaced already) its the actual rubber part of the line where they crimp to the metal line that goes back to the trans. When my rad was replaced they told me the cooling lines were replaced but apparently not. They look original to me. This attached pic is where its leaking further up the line


    2013-02-19 09.43.42.jpg

    new lines expected today.

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    odthetruth's Avatar
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    Re: Leak near trans cooling line

    If I was changing lines, I'd change to external cooler.

    Its only a matter of time, from what myself (and many other members here) have seen.

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    Re: Leak near trans cooling line

    Has anyone with an external cooler, in a cold (winter) climate, had any problems with the tranny when it is extremely cold out ?

  13. #12
    RCVW's Avatar
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    Quote Originally Posted by Argent1 View Post
    Has anyone with an external cooler, in a cold (winter) climate, had any problems with the tranny when it is extremely cold out ?
    Im in NYC...not terribly frigid here but it has hit the high teens over the last few weeks and with my trans cooler I tend to let the engine warm up to operating temp. (about 160°) and then I run the car through D, 4, 3, 2 and Reverse for a few seconds each a couple of times while depressing the brake...when I didnt do that and just warmed up and drive off, the transmission is slower to shift for the first few miles.

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    Re: Leak near trans cooling line

    Thanks. I was hoping to hear from someone where it gets to -20C and colder, also.

  15. #14
    khpappas's Avatar
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    True it could (will) happen again in the future. But since i dont drive 25k miles a year like i did in the past im not going to worry about it.

  16. #15
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    Re: Leak near trans cooling line

    Been -30C to -40C here a lot this winter. Haven't had any problems. I switched to external cooler almost 2 years ago. When it's super cold out shifting may be a bit slow before it warms up all the way, but it was like that without the external cooler.

    Where are you from?

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