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Coolant leaking

craig20102010 Dec 20, 2017

  1. craig20102010

    craig20102010 Member

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    So iv had the car around 7 months now and I've noticed after i had a warning for low coolant. Checked the bottle and it was empty. Admittedly I didn't check it when I bought the car but I wouldn't of noticed as the bottle is stained.

    I topped it back up above the min mark and iv looked again and it's now below the minimum mark. Problem is I can't see any signs of a leak..

    Is there any common areas that these leak? Known faults?

    It's a 2012 A6 3.0tdi quattro 245ps.

    Thanks Craig.

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  3. Rhyso

    Rhyso Well-Known Member

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    Could be the EGR cooler?
     
  4. craig20102010

    craig20102010 Member

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    How would I know? Is the egr cooler easy to get too?

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  5. Rhyso

    Rhyso Well-Known Member

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    Possibly the undertray is catching most of the fluid and it gets burned off? I guess you'd need the system pressure tested whilst the car is up in the air

    I don't believe so :( I know a mate of mine had his replaced by Audi on his BiTDI and that was £900......he was lucky he had an aftermarket warranty and Audi picked up the bill
     
  6. craig20102010

    craig20102010 Member

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    Certainly won't be paying £900 to have an egr replaced... But I guess that's better then spending £5000 on having a new gasket fitted to the engine.

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  7. evans1089

    evans1089 Active Member

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    Did you manage to find the issue Craig?
     
  8. fafa

    fafa Member

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    Mine's just started doing this, coolant bottle was almost empty - I topped it up yesterday so it was half way between min and max and this morning it's dropped below min. I only drove it a couple of miles after topping it up. Anyway, I've taken it to my local garage and he said he'd do a pressure test on it. I don't see any sign of leaking on the driveway. I'm worried this is going to be expensive, perhaps I should have paid to extend the warranty which would have covered me until March.
     
  9. fafa

    fafa Member

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    Just as I posted he rang me.. Water pump is leaking and it will cost about 270 quid to replace.
     
  10. craig20102010

    craig20102010 Member

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    I haven't checked mine since this post.. I'll check mine tomorrow and if it's gone down I'll be going to the garage as well. I hope mine is as simple as yours.

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  11. evans1089

    evans1089 Active Member

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    Just to update everyone.
    Last week I took my bitdi in as it was using or leaking water too often. I read reviews of it being EGR cooler or worse.
    It ended up being the coolant hoses at either end of the radiator to start with. So no big issues.

    Whilst we were down there, we decided to change the water pump from a local auto factors.
    Replaced the seals and pump, took it home. Next day, still leaking...
    This time the water pump seal was at fault.
    So I rang Audi, they said they had never sold a water pump or belt for my engine before. I paid £110 for the pump and £50 ish for a new belt directly from them.
    All fitted and word from the garage, no more leaks now, and i'm collecting it later from the garage.
     
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  13. craig20102010

    craig20102010 Member

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    I hope this is the case with mine as well then. Other wise I'm knakkered.

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  14. evans1089

    evans1089 Active Member

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    So just collected it. Got it home...
    And it’s wet again.
    Under load it’s dripping somewhere. This time my mechanic has added UV fluid into the coolant to see leakages under a uv light.

    We’re going to have to remove the front end to see everything at eye level.
    Will update next week.


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  15. evans1089

    evans1089 Active Member

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    My situation is looking more like the EGR cooler. Anyone got any advice?
    Just buy a new one?
     
  16. craig20102010

    craig20102010 Member

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    Mine has just been pressure tested and he couldnt find any external leaks on the engine. That to me would look more likely to be the EGR cooler or the head gasket. Any one had any trouble with a head gasket leaking.

    Can anyone help me determine which one it may be? Will removing the EGR cooler make it obvious that there is a leak within this unit?
     
  17. evans1089

    evans1089 Active Member

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    Mines been pressure tested about ten times, even using UV liquid.
    It only leaks under load or when driven. Which points to the egr when the valves open etc.


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  18. craig20102010

    craig20102010 Member

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    So yours might actually be the egr valve its self. I can't believe this is a common fault and it still happens on the bitdi. I'm taking mine to a specialist on the 23rd so hopefully he can pin point the leak. Unfortunately mines not as cut and dry as yours in that I can't even see a leak so mines leaking internally which is not good. I just hope it's not the head gasket.

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  19. craig20102010

    craig20102010 Member

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    Anyone know if the A6 has two heater matrix's for the dual zone climate control? Or does it just have the one and splits the air supply?

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  20. Tendaimwari

    Tendaimwari Member

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    thread bump: Did you ever resolve this problem? Was it the EGR?
     
  21. craig20102010

    craig20102010 Member

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    No sorry still haven't had it looked at. The leak is so small it'll be hard to trace I think. It's on my list of jobs to check.

    I'm still trying to work out what the issue is with my heating on the driver's side only.

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  22. evans1089

    evans1089 Active Member

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    Mine was egr cooler. After going through and replacing water pump and belts.


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  23. Tendaimwari

    Tendaimwari Member

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    Cheers.I think mine's given up the ghost or should I say coolant....
     
  24. craig20102010

    craig20102010 Member

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    It's on my list lol. I'd like to get it into the garage to get it tested.

    How much did it cost for you to get it replaced?

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  25. evans1089

    evans1089 Active Member

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    I’ll dig out the invoice!


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  26. xmgcx

    xmgcx New Member

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    craig20102010 did you ever find the cause ?

    I also have a 2012 A6 3.0 TDI 245 and have the same problem i.e. slow'ish coolant loss with no obvious signs of a leak.
     
  27. evans1089

    evans1089 Active Member

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    Sorry for my late reply: IMG_0631.jpg


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  28. xmgcx

    xmgcx New Member

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    Thanks for uploading this.

    I'm pretty sure mine is also the EGR cooler, taken a peak as best I can with a torch and there is watery looking liquid below the cooler.
    Were there any other standout symptoms or tests that led you to the EGR ?
     
  29. evans1089

    evans1089 Active Member

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    We did an ultra violet light test by adding something to the coolant water.
    On the road, under load it was spraying it everywhere so was hard to pin point.
    In the end, we stripped the front end off.
    Located the cooler and kept an eye on it whilst it was running and on the ramp.
    Evidently we saw a slight drip from it, which was enough to warrant a new one, along with belts etc.
    Not seen a drip since !



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  30. xmgcx

    xmgcx New Member

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    Evans1089 thanks for that, very useful info.
     
  31. Tendaimwari

    Tendaimwari Member

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    I noticed a pool of fluid on the garage floor that is coming from the rear of the engine on the passenger side. Is this where it would comefrom if the origin is the ERG Cooler?
     
  32. xmgcx

    xmgcx New Member

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    Tendainwari - From my experience no it doesn't sound like the EGR, most EGR coolant leaks (from the 3.0TDI v6) seem to be slow leaks that almost go unnoticed, often leaking into the EGR itself and being sucked into the engine and turned to steam or weeping out onto the surface of the bottom of the V casting of the engine under where the EGR is mounted.
    I am no expert but yours initially sounds like it maybe coming from something else?
     
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  34. evans1089

    evans1089 Active Member

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    Check the coolant hoses from the expansion tank.


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  35. craig20102010

    craig20102010 Member

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    Has anyone got a photo of where the egr cooler is located?

    I wouldn't mind having a look my self.

    I currently have a problem with the heating in my car as well. No heat on the drivers side. IV checked it all out and I'm thinking someone has used radweld or such product to try stop the leak and they have blocked part of the heater matrix.

    Anyone know anything that would break down the likes of radweld ect?

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  36. evans1089

    evans1089 Active Member

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    I think my mechanic said it was egr seals.


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