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Coolant problems

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Rajiya_ne_Oudi, Oct 18, 2009.

  1. Rajiya_ne_Oudi
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    Rajiya_ne_Oudi Member

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    Hi guys I have had my 2.0 tdi for about 2 years now its never given me any real headaches but recently I have noticed the coolant light keeps comming on every 3-7 days and I have to top it up all the time, I have checked for leaks and this is not the case, The car is used during the week for motorway runs of about 30miles round trip work and back car is seviced on time and not really pushed that hard any ideas???:think:
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  2. pjmspeedy
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    pjmspeedy Dude, what's mine say ?

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    Check your bleed screw......
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  3. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    Happened to me too. Once last year and once last week. In both times the temperature outside was very low, near freezing. It never happened when warm outside.
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  4. SAiLO
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    SAiLO Enthusiast

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    The bleed screw? Don't want to sound like a complete noob, but what screw is that?
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  5. pjmspeedy
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    pjmspeedy Dude, what's mine say ?

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    It lets you get rid of any air that may be trapped in the system.

    It depends on what engine you have to where it is located but if you have a 1.8T then it is located on top of the metal pipe that is just under the plastic engine cover.
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  6. Rajiya_ne_Oudi
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    Rajiya_ne_Oudi Member

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    its not the bleed screw....any other ideas chaps
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  7. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    I've read on forum in Romania about this issue. It seems to be quite common on 2.0 TDis. Usually happens when running at higher speeds, outside of cities. Some seals fail an let coolant leak. You won't be able to see where this is happening because the coolant evaporates and leaves no sign.
    I'll try to find out how is called in English the faulty parts.
    #7
  8. SAiLO
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    SAiLO Enthusiast

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    Looking forward to your findings Johnny Bravo.
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  9. Six-speed
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    Six-speed New Member

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    Have you checked to see if the electrics going to the level indicator are intact. They may have corroded and be giving dicky readings. Is the level actually falling or is it just the light flickering?

    :busted_cop:
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  10. Rajiya_ne_Oudi
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    Rajiya_ne_Oudi Member

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    No its actually loosing water went to london over the weekend did 300-340 miles there and back and had to top up the coolant on 3 occasions really is starting to bother me now seems like im going to have to visit the experts if no one on here can suggest anything?
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  11. SAiLO
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    SAiLO Enthusiast

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    I got a chemical smell in the cabin after I leave the car when finished driving and come back to it. Is it coolant? Would it be the pipes leaking?
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  12. M7R
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    M7R Type Approval Engineer,

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    it could be a few things...could be the head gaskets weeping at higher boost, so easy check to do:

    with the car cold open the head tank is there any pressure in it? (there should be non if there is thats not a good sign but we will come back to that..)

    tighten the lid back up and start the car

    give it a min to idle tn give it some revs to get the car on boost, get the revs up past 2k and hold for a min or so, but dont hold it there long enough that the car starts to come up to temp.

    return to idle,

    open the header tank, is there pressure there already? if so the head gasket is going and pressuring the coolant system which will be forcing water out past a seal on boost, when crusing on the motorway the revs are up and the turbos on full chat hence the use when crusing but no round town.. my old mk4 did this, it would force the coolant out past the water pump, but most of it was sucked into the combustion chamber and sent out the exhaust making the back window very oiley and messy! 1 head gasket change on the drive and an inspection of the head, all was deemed well, rebuilt with new gen parts and then I chipped the car, (that was with 170k on it! it had been using water since about 150....as I waited for the cambelt change to do it) the car is still gong now with its new owner at well past 200k!)


    other things to look for are:

    sniff the coolant, if its smells a bit diesel like then again head gasket,

    look around pipe joins for a pink dryed substance, that shows G12 is leaking out, the water part evaps off but over time it will leave the pink chemicals behind as a tell tail

    wet carpets near the centre console? - heat matrix is leaking, another point to this can be windows that steam up alot and sweet chemical smell in the car.

    park the car some where clean over night after a long run and look for water drips, a peace of cardboard can help as again that will not allow all the coolant to evap / run away it will leave a mark where its been wet and stained.
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  13. SAiLO
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    SAiLO Enthusiast

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    Thanks a lot for the info I'll do those checks and come back with the results.
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  14. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    M7R is right! that's what I also found out. You may check on the right side of the spoiler for wet spots and check the oil level. In some cases the coolant got into the engine and mixed with the oil.
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  15. SAiLO
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    SAiLO Enthusiast

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    So I had a look, doesn't seem to be any pressure in the system on a cold car.

    Sniffed the coolant tank and not even a note of diesel or exhaust fumes. Pink in colour, no contaminants.

    Haven't seen any pink residue on pipes under the bonnet only a bit of white on one plastic bit.

    Oil right in between min and max levels.
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  16. M7R
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    M7R Type Approval Engineer,

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    any pics of the white bit?? the coolant must be going some where. pics of all coolant joints etc would help,

    plus like others have said double check the coolant drain, it can be found next to the bottom hose on the rad so you will more than likely need the belly pan off and the car on a jack / ramps to get under.
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  17. SAiLO
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    SAiLO Enthusiast

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    I'll take the photos as soon as the weather improves as it is really pouring down with rain + windy at the moment! Looks like the winter announced its arrival.
    #17
  18. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    A bit of white, like a white deposit? You know, the anti freeze is sweet. I'm thinking if it licks on something and then evaporates it would leave such white deposit (crystallized sugar like).
    #18
  19. SAiLO
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    SAiLO Enthusiast

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    White bit circled in red. I only spotted it in one place though, on the clip.

    [​IMG]
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  20. SAiLO
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    SAiLO Enthusiast

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    I think I just found the cause of a funny smell in the cabin.....

    Had a bottle of RainX spray in my boot and when I put it in there a few weeks ago it was three quarters full. Tonight I wanted to clean the windows and ... it was completely dry!! :w00t:

    Lol don't know how the bottle opened itself, but at least it's not the coolant! :cool:
    #20

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