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Thread: Coolant leak

  1. #1
    Registered Member One Ring
    Join Date
    Apr 16 2018
    AZ Member #
    417166
    My Garage
    81 Scirocco, 03 Explorer and 99 beetle turbo
    Location
    Olympia, Washington

    Coolant leak

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    So when I first bought my A4 Quattro 3.0l it needed a lot of stuff since then and 4500 bucks later the coolant system was completely gone through new thermostat and expansion tank new coolant and new heater core, in addition to a lot of other not coolant system related parts. I was having no issues till a leak developed behind my engine by the rear firewall... in the past it was the thermostat O-ring that was leaking and the coolant was dripping off the back side of the engine due to the tilt of the engine, I checked the the upper intake manifold is dry the water pump is dry are there any hoses back there that could leak


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  2. #2
    Registered Member Two Rings
    Join Date
    Mar 27 2018
    AZ Member #
    416167
    Location
    Maryland

    Sounds like the engine coolant flange. I have an 05 A4 with same motor. Others call this the rear coolant flange. I am having the same issue. A dried trail of pink and whitish crust coming off a fitting from the flange. I havenít fixed it yet as I had to do my timing belt, water pump, etc. this weekend. From what ive seen and heard, it is a PITA as it is tight quarters back there. I may even get a quote from a shop. Not sure if I have the time to get it done. Let me see if can find my post about it. I was sent a few pics. I will be back shortly.

  3. #3
    Registered Member Two Rings
    Join Date
    Mar 27 2018
    AZ Member #
    416167
    Location
    Maryland

    This is what I was sent by the member Gosser. He was very helpful. Good luck. Guess we can see who gets it fixed first 😀

    On the diagram, it was #21 that was his issue as well as mine. Simple enough if it was easily reached.
    I guess I should have said the one pic with the mess is once he cleared eaveything out, while the other is after he titghtened the small nut at that fitting. He pulled it and put Teflon tape on and it has been dry for the last 10,000km. Mine is the same set up. The flange itself isnít leaking from the engine. It appears it is coming from the fitting unless the flange has a small crack in it. But that flange is metal, and I donít want to swap it to a plastic one if not needed.
    Attached Images

  4. #4
    Senior Member Three Rings pablolizarraga's Avatar
    Join Date
    Jul 18 2014
    AZ Member #
    264970
    My Garage
    "Hers": SQ5 His: 1966 Ford Mustang Coupe, 1965 Ford Mustang Fastback
    Location
    Los Angeles, CA

    Hereís 2 other potential leak sources.

    IMG_2473.JPG

    IMG_2474.JPG

    I just replaced the coupler on my coolant supply hose w/ this $5 URO coupler (3B0122291B).

    IMG_2467.JPG

    Inner diameter is a bit smaller but so far so good. To access, I just had to remove the breather tube from passenger side valve cover, disconnected some vacuum hoses above throttle body, and the plastic tube that connects to throttle body. Youíll have to push aside harness to get to that supply hose. Pull the metal clip and shimmy that coupler off. Be patient w/ removing coupler so as to not to damage the tube where it connects to; which I believe was plastic.

    Good luck!


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  5. #5
    Registered Member One Ring
    Join Date
    Apr 16 2018
    AZ Member #
    417166
    My Garage
    81 Scirocco, 03 Explorer and 99 beetle turbo
    Location
    Olympia, Washington

    Thank you to all, Iíll investigate


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  6. #6
    Active Member Two Rings
    Join Date
    Nov 03 2010
    AZ Member #
    66528
    Location
    Yorba Linda, CA

    I had the rear-of-engine coolant leak, and it was a deteriorated/cracked coolant manifold, shown in red on the diagram above. About $120 for an OEM part, harder to change out than I had expected due to some tight clearances in a few places. Moving the fuel injector rail out of the way, and then removing the intake manifold, was the easy part. SAI pipes also have to be moved out of the way, and I had to disconnect the combi valves for the same reason. With all that effort, you'd think I would have replaced the O-rings, but they seemed perfect, and with a little Silicone sealant smeared on right before installation, I have had zero leaks for a couple of years now.

  7. #7
    Active Member Two Rings
    Join Date
    Feb 24 2011
    AZ Member #
    71458
    Location
    Pittsburgh

    Quote Originally Posted by Dodaman View Post
    This is what I was sent by the member Gosser. He was very helpful. Good luck. Guess we can see who gets it fixed first 😀

    On the diagram, it was #21 that was his issue as well as mine. Simple enough if it was easily reached.
    I guess I should have said the one pic with the mess is once he cleared eaveything out, while the other is after he titghtened the small nut at that fitting. He pulled it and put Teflon tape on and it has been dry for the last 10,000km. Mine is the same set up. The flange itself isnít leaking from the engine. It appears it is coming from the fitting unless the flange has a small crack in it. But that flange is metal, and I donít want to swap it to a plastic one if not needed.
    My issue was no.16 o-ring... though, don't let the forward position fool you... the valley fills up then runs over the rear of the engine around the trans bell housing.
    2005 A4 B6 3.0L USP Ocean Blue

  8. #8
    Veteran Member Four Rings Gosser's Avatar
    Join Date
    Jun 05 2013
    AZ Member #
    116640
    My Garage
    2005 A4, 1988 Buick Lesabre T-Type
    Location
    Ottawa

    If you need that red highlighted pipe, let me know, I have a brand new one in a box still that I have no use for:
    https://www.ecstuning.com/b-genuine-...pe/06c121085h/
    will let it go for 70 bucks shipped.
    2004 S4 MT - Summer
    2005 A4 3.0 AT - Wifes
    2004 A4 1.8 6MT - Winter
    2003 A4 1.8 CVT - Winter



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