Notices
 
 

  

User Tag List

Thread: 2012 A6 quattro 3.0Tdi EGR coolant leak advice

Page 2 of 2 FirstFirst 12
Results 11 to 19 of 19
  1. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #11
    Join Date
    Dec 2013
    Location
    East Sussex, UK
    Posts
    93
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Thanks for the translation.....it looks like the regulating valve is a common failure point on these from other YouTube videos and vids that were posted up on this thread. I've ordered all the seals and gaskets plus the manifold assembly and the regulating valve assembly.....total came to £89 so hopefully will get chance to strip down and rebuild it over the next few weeks. Many thanks for all the replies and for the translation. Much appreciated.
     
    0 0 0
     

  2. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #12
    Join Date
    Dec 2013
    Location
    East Sussex, UK
    Posts
    93
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Ok....so moving on from this i was forced into action sooner than I intended as the serpentine belt snapped on the engine. So I made space in the garage and commenced work.

    Removed the front bumper, headlights and the radiator and intercooler to allow maximum space and to get into the engine better....plus I was changing the belt and idler pulleys too.

    Stripping out the top of the engine was a fun job....there are so many electrical connectors and looms.....even getting the intake manifold is not that simple. EGR cooler was clogged up so I cleaned the tubes out. The throttle body by the EGR was covered in carbon and crap from the poxy EGR so cleaned those all up too.

    Found the leak issue was caused by the actuator assembly mentioned previously...the plastic body had split at the actuator pivot so the coolant was leaking out there. Took out the oil cooler and cleaned the V out of oil and coolant etc......put it all back together with new seals etc and a new actuator assembly.

    Replaced the water pump while I was there doing the serpentine belt. Have put it all back together and changed the oil filter and oil (took more than usual due to removing the oil cooler etc) which was about 7.2 litres of oil compared to previous oil changes where its more like 6.5 litres. Recharged the coolant system using a vacuum charging kit which made it a doddle. Have bled the last of the air out of the system via the EGR cooler bleed point and the heater matrix bleed point by the windscreen. Took approx 10 litres of coolant.

    Cleared any faults with VCDS and then took it for a test drive. All seems OK. Heating gets toasty warm.....although I may revisit it as the drivers side is blowing colder air than passenger side. Dont appear to be any leaks but will keep an eye over the next week or so.

    But here is the weirdest thing......the passenger side knee airbag short to ground fault has gone? No idea why.....maybe where it has been inside a dry garage for the past 10 days while I've been working on it intermittently?

    Anyway all up and running and happy to have her back on the road. Thanks for the videos that were posted up and the translation services....they were invaluable.
     
    0 1 0
     

  3. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #13
    Join Date
    Jul 2010
    Location
    lichfield uk
    Posts
    14
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    Happy to hear that you manage to fix your car. Did you had any colant leek on the serpentine belt ? What's the milage ?
     
    0 0 0
     

  4. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #14
    Join Date
    Dec 2013
    Location
    East Sussex, UK
    Posts
    93
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    There was no coolant leak on the serpentine belt....I think that was just one of those things that failed and happened to be at the same time. The car has covered 105,000 miles.
    To be honest taking all the radiators etc off gave me much better access to the engine for changing the areas where it was all leaking anyway.
     
    0 0 0
     

  5. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #15
    Join Date
    Nov 2018
    Location
    Iow
    Posts
    1
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    Hi, looking at doing the same job, I've bought all the parts but I'm having second thoughts and thinking of getting a garage to do it after seeing more videos it looks a total bitch!! Is it that bad it looks worse than it is? Thanks
     
    0 0 0
     

  6. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #16
    Join Date
    Dec 2013
    Location
    East Sussex, UK
    Posts
    93
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    I guess it depends on how practical you are? My hand was forced as the serpentine belt snapped so it made me tackle the job in the winter...but luckily I have a garage that I managed to squeeze the car into.

    I think the job took me 2 days in total....I also replaced the water pump and a few pulley bearings as well while I had the front of the car stripped down due to renewing the serpentine belt and removing the remains of the old belt.

    Take pics while you're stripping it down....you'll appreciate them when you come to put it back together. Also maybe get a paint pen and make marks on pipes, electrical connectors to help you identify where they connected.

    The job isn't too difficult. You will need to drain the coolant system down and I would probably suggest doing an oil change after this job as well. I certainly wouldn't want to do it on the driveway in the winter.

    The part that leaks is unfortunately right in the centre of the engine so you need to remove loads of stuff to gain access. Lots of seals/gaskets to renew. I imagine it would probably be a quite costly job if you took it into a garage as it is quite time consuming.
     
    0 0 0
     

  7. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #17
    Join Date
    Dec 2013
    Location
    East Sussex, UK
    Posts
    93
    Post Thanks / Like
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)
    So roll onto 2023 and once again my coolant is needing to be topped up and I can see coolant accumulating in the centre area of the engine block. It appears that the regulating block has failed again....as per the previous failure mode

    Checking parts catalogue I can see the regulating valve has been superseded......previously it had a suffix of H but is now on revision M. Calling my local Audi to check parts they have 100s of these in stock....so that suggests that there is a problem with their design and that they fail quite frequently.

    It's lasted approx 40k miles since I changed it last time! Already dreading stripping all the stuff out for access etc.....

    Its yet another piece of kit which is designed to help reduce emissions but just overcomplicates things and makes more things to go wrong.
     
    0 0 0
     

  8. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #18
    Join Date
    Nov 2019
    Location
    Dinnington, South Yorkshire
    Posts
    15
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    3 Post(s)
    Thanks for all the information and updates in this thread. I have a mystery coolant leak on my BiTDi. I haven’t shone a torch right down into the valley yet but I did see a couple of drips near the front of the block and the serpentine belt looked like it was wet. I’m losing a litre or so over about 300 miles. I have a feeling it’s going to be the gaskets round the Egr cooler or the actuator. Do you have a complete list of parts you ordered, or did you just order what was in the video from Mat? How did your secondary fix go earlier this year? Was it the same issue again? I fear I have a few long nights ahead of me…

    Edit for spelling.
    Last edited by Harvy23; 07-11-2023 at 12:21 PM.
    A6 Avant 3.0 BiTDi 320ps Quattro S-Line 11/14
     
    0 0 0
     

  9. Re: 2012 A6 quattro 3.0Tdi EGR coolant leak advice 
    #19
    Join Date
    Mar 2014
    Location
    Aylesbury Bucks
    Posts
    330
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    19 Post(s)
    I've just done mine, CDUD engine. The coolant valve is now 059 121 737 AM, so it's been revised again.
    Yes, it's a very fiddly job, so many things in the way of hard to get to bolts. It's a job that if rushed will go very wrong, particularly, as any bolts and tools dropped are gone for good, so strip it all down again to retrieve.
    Notes-
    An aquavac is a must, as I had a lot of coolant and oil escape when taking the oil cooler off.
    The O/S fuel rail feed pipe will need to be disconnected from the rail, and moved slightly to access one manifold bolt.
    The manifold needs to be pre-loaded with at least one bolt, as one is impossible to fit once the manifold is in position.
    Allow time to clean soot from the manifold, EGR pipe, and butterfly valve. I used Mr Muscle oven cleaner, and it's a VERY messy job! Although after 100,000 miles it wasn't too bad.
    Replace ALL seals and coolant components.
    The fuel pressure sensor is in the way of the manifold removal. If you remove it, it has to be replaced or it will leak £138.00. Spend a few minutes more unbolting the rail to move the sensor out of the way.
     
    0 0 0
     

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Another coolant leak! Photos within. 3.0Tdi Q7
    By davidjessop in forum Q7 - 4M Forum - 2016 -
    Replies: 21
    Last Post: 09-06-2020, 10:07 PM
  2. Replies: 2
    Last Post: 05-09-2019, 10:07 AM
  3. Please Help Passat 2012 B7 1.6 tdi water / coolant leak at oil cooler housing
    By Strath44 in forum Passat - B7 Forum - 2011 - 2015
    Replies: 0
    Last Post: 12-12-2018, 01:13 PM
  4. Passat 2012 B7 1.6 tdi coolant leak
    By Strath44 in forum Passat - B7 Forum - 2011 - 2015
    Replies: 2
    Last Post: 06-07-2018, 05:38 AM
  5. New (to me) 2012 Audi A6 (C7) 3.0tdi Quattro SE experience so far...First post!
    By Mintyjim in forum Audi A6 - C7 Forum - 2011- 2018
    Replies: 13
    Last Post: 17-01-2017, 08:42 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


 



  


Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -