2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator
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  • 2 Post By odthetruth
Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I noticed today that the drivers side oil cooler line is leaking where it connects to the radiator. Is this ...
  1. #1
    joe0373 is offline Cadillac Owners Member
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    2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    I noticed today that the drivers side oil cooler line is leaking where it connects to the radiator. Is this something I can fix myself by perhaps tightening? Does it have a seal of some kind? Any advice would be appreciated!!!

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  3. #2
    concorso is offline Cadillac Owners Master
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    I wouldnt drive the car until its fixed. Someone here will suggest the proper way to fix this. Its a common issue that you caught early.

  4. #3
    Kingoftypos is offline Cadillac Owners Master
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    The oil cooler that you speak of is for the transmission, yes?

    If that is the case, I suggest buying an external transmission cooler. Granted, it's not a "factory fix". But IMO it's a better one.

    I had mine installed a couple of weeks ago and I am throughly impressed with the sublet differences. The most noticeable difference is in stop and go traffic. Before, after a couple of minutes in the traffic jam. You will notice that when the traffic moves, there's a little lag time before you "feel" the transmission engage. That is with the factory set-up. With the external cooler, it engages right away with very little lag time. Reason, is because the transmission fluid is much cooler than it was before.

    KOT

  5. #4
    joe0373 is offline Cadillac Owners Member
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Yes its for the transmission oil, I'm hoping though that its an easy fix...anybody else with a suggestion?

    Thanks!

  6. #5
    Kingoftypos is offline Cadillac Owners Master
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    Replace the radiator, or external cooler. There's no fix for those awful connection points.

    KOT

  7. #6
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    odthetruth is offline Moderator
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Quote Originally Posted by Kingoftypos View Post
    Replace the radiator, or external cooler. There's no fix for those awful connection points.

    KOT
    These are your choices, OP. If you go ahead and mess with it, disconnect it... there's a high probability you won't be able to reconnect it back because it will not thread back in. I've seen it first hand on what was supposed to be a regular transmission line change.

    I'd go with external trans cooler. You can also replace the radiator. However, those are your only 2 choices. You try to do anything else, you're playing with fire IMO. There's a thread PAGES long on those fitting points having failed... coolant sucked into transmission, transmission failure... etc.

    [2006 CTS-V - "The Vee Baby Seamus"] - 372rwhp / 361rwtq
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    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    External cooler gets my vote, the internal integrated with the engine coolant ones cant cool efficiently together after extended usage and lack of maintenance, could take it to a rad shop and have a new connector put in but for what money you spend doing that the external cooler will give more benefits.

  9. #8
    Argent1's Avatar
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    I still haven't heard from anyone in a cold winter area that installed an external cooler, about how the trans reacted during sub zero weather.
    Did I miss it ?

  10. #9
    joe0373 is offline Cadillac Owners Member
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Thanks for all your input. Either case its off to the rad shop I go! It doesn't sound like a job for my driveway...gonna take the cheapest option though...My car has 270k on it, its been a trooper but its almost time to updrade to a 2nd Gen AWD

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    Kingoftypos is offline Cadillac Owners Master
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Quote Originally Posted by Argent1 View Post
    I still haven't heard from anyone in a cold winter area that installed an external cooler, about how the trans reacted during sub zero weather.
    Did I miss it ?
    If someone truly came around and mentioned how it works in the winter time. Then I, we, all of us must of missed Summer, Fall, Winter of 2012 and Spring of 2013.

    KOT

  12. #11
    odthetruth's Avatar
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Cheapest option would be external trans cooler, then JB welding the nuts into the rad shut.

    @Argent - I remember someone from canada posting that he was using one and had no issues. I think it was in the dedicated page.
    Argent1 and Argent1 like this.

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  13. #12
    Argent1's Avatar
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Quote Originally Posted by Kingoftypos View Post
    If someone truly came around and mentioned how it works in the winter time. Then I, we, all of us must of missed Summer, Fall, Winter of 2012 and Spring of 2013.

    KOT
    No, not if they installed one in 2010, 2011 or before. It doesn't have to be any specific winter, just a winter...............

  14. #13
    Kingoftypos is offline Cadillac Owners Master
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    Re: 2004 3.6L Cadillac CTS Oil Cooler Line Leaking at Radiator

    Quote Originally Posted by Argent1 View Post
    No, not if they installed one in 2010, 2011 or before. It doesn't have to be any specific winter, just a winter...............
    Well I don't know about your area, but 2011 winter in mine was super warm. When it did snow, the snow only stuck around until the next day. Where as in 2010 it would stick around for days into weeks. ha

    Honestly, I am a bit concerned about how mine is going to act this winter. But there again, I have a plan of starting the car a minute or so before I get it. Which I normally do when it's freezing out. I do that just to get the oil circulating in the engine, not for me to be warm. Heated seats are used for that, ha ha. Then once I get in, I'll take it even more easy on the driving until the fluid gets warm. Of course if there is no huge difference, then I would just drive it like I normally do in the winter time. Of course I won't pedal to the metal like it's summer out. But I won't baby the thing either.

    KOT

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