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Thread: 2012 A6 quattro 3.0Tdi EGR coolant leak advice

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  1. 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #1
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    Evening

    I'm hoping that someone may be able to advise in relation to where the EGR coolers leak from.

    I have recently been using coolant and I think it is from the EGR cooler area judging by the liquid that I can see when I shine a torch in that appears to be pooling in the centre of the engine.

    I have the 3.0 TDI (CDUC) V6 engine with the single turbocharger

    Why do the EGR coolers leak? Is it an internal failure of the assembly or is it simply a case of seals/gaskets failing that could be replaced without the need to renew the EGR cooler complete?

    I've been doing some searching on the Internet and lots of reference to EGR cooler leaks....but nobody goes into detail about why is actually leaking if that makes sense?

    Any insight or information would be much appreciate before I strip out the intake manifold etc....to gain access.

    Many thanks in advance.
    Audi A6 Avant - 3.0 tdi Quattro - S-line Le Mans edition
     
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  2. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Hi. It might not be egr cooler its self,because there are a lot of o rings and rubber gaskets that can and do leak after time.
    I saw video on youtube and guy runs garage and was doing this job. He showed which gaskets he replaced and part numbers too. It is in polish though.
    Few links here
    AUDI A6 4G 3.0TDI UBYTKI PŁYNU CHŁODNICZEGO - YouTube

    AUDI A6 C7 3.0BiTDI Poważny Wyciek Płynu#MatPanewka# - YouTube
     
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  3. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Ive had the same problem on my BiTdi and replaced all the o rings under the intake manifold. Whilst it was apart i managed to find a brand new genuine EGR cooler for 100 instead of the 760 audi want for it. The main culprit is the black plastic regulating valve. its a bit crappy and fails regularly. Not too bad at 66.
    RS6 Performance Ascari Blue, Carbon Ceramics Brakes and lots more.
    A6 BiTdi Avant MTM
    Retrofitted: Full Led Headlights, DAB, Full Electric Seats, Surround View Cameras, Genuine RS6 Grille, RS6 Seats,Leather Door Armrests, Soft Close Doors, Rear Side Blinds,High Beam Assist, Eibach Springs, Led Roof Console, 4 Zone Climate, Rear Heated Seats, Head Up Display, Side assist, Alcantara Interior Retrim
     
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  4. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Hi....many thanks for the replies and links. I've been studying exploded parts diagrams of all the parts involved in the cooling circuit and I cannot for the life of me see why the EGR cooler itself as a complete assembly needs to be renewed unless the body corrodes through?
    Completely agree about the regulating valve as that is a plastic assembly and I could definitely that failing and have see a thread on another forum where it had....but other than a number of seals the EGR cooler is an assembly that looks to be cast and has one seal/gasket that sits between the 2 halves of the body 059131599G....but other than that the rest is just o-rings.
    Seems strange to spend nearly £600 on a complete new EGR cooler assembly 🤔 . Obviously I understand some people change them for issues with DPF and similar EGR related issues.....but I guess I just can't understand how a cast assembly can leak water other than through seals which are relatively cheap items comparative to the cost of a brand new assembly
    There are various seals on the regulating valve and the intermediate flange assembly and there are also some seals on the oil cooler assembly that the cooling system ports through. So I think I will order all of those before I strip it down and a regulating valve assembly as they are about £50 and a known weak point. Then strip out the intake assembly etc....to gain access and see what is going on in that area.
    Someone else told me to just chuck some KSeal in but I would rather fix the issue properly so I know what the cause was.
     
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  5. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Hi. I would not put KSeal simply because it will gunk up your cooling system and it really is only temporary solution to the problem,so best to get it done once and properly.
     
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  6. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Hi have not experienced this but it does seem to be a fairly common issue. Am I correct in thinking that the cooler is feed from the engine cooling system, if so could antifreeze be part of the problem. As it contains anti corrosion elements could it be that not replacing it every couple of years is causing seals etc to start to fail. As I say just a thought may be completely wrong but it would make sense when you think bout it. GLA
    2015 FL S-line 2L ultra & 2003 225 TT Coupe
     
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  7. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Thanks for posting up those videos.....its a shame about the language barrier as I would love to know what he is saying at certain points in the videos....but the content clearly shows what an issue it is given how much coolant is present in that area. I think that the EGR cooler only really needs replacing it the core is clogged and it is just the seals and the 2 plastic manifolds that are the likely failure points. Mine has just passed 100k miles on the odometer. Putting together a list of all the seals etc....that I might need and the necessary coolant etc....then will probably tackle it next month when I get some time.
     
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  8. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Hi
    I should be able to translate that for you. Just pinpoint time frame of your interest.
     
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  9. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    That would be amazing.....the section is around 12 mins into the video where he is showing the parts that he has purchased. There is a bit where he is holding up what looks like the water pump shroud.....and I'm confused as to why that has come off and whether that needs to actually be renewed ....as it does not appear on the printed parts list or the bag labels that he shows in the video.
    Many thanks in advance.
     
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  10. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
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    Ok so video with BITDI engine Mat reckon that leak is from the part his holding in the hand at 9:43 min. into the video it's leaking from the shaft that runs a cross of that tube[in the middle]. The section you ask about 12 min. into the video his talking about how flat is the gasket and he is going to replace both of them. Video with 3.0TDI Mat suspects the leak from the o_ring his holding in 10:00 min. into the video.
    I hope it's all clear to you.
     
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