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S3 coolant level, thoughts please.

RPB Oct 13, 2012

  1. RPB

    RPB Active Member

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    Hi all,
    I have had my S3 now for just over a year (wow, that has flown!) and the coolant level was on the minimum line of the expansion tank so I put in some more Audi stuff (ffs, how much?)
    I cannot see any leaks, so over time where is this going? LOL. Even though it is supposedly a sealed system and the additives change the boiling point, etc, does it still evaporate?
    Now don't get me wrong, having a car thats done 12k miles over a year and only having to fill up from min to max does not worry me, it is more of a "where the hell does it go?" type question.
     
  2. thebambam

    thebambam P.I.M.P

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    I think its just boiling away ie steam I guess. Assuming the quicker you go the hotter it gets It will boil away faster?
     
  3. bmh.01

    bmh.01 Member

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    It's leaking somewhere. It's a sealed, pressurised system to stop it from boiling off.

    That said, top to bottom of expansion bottle marks isn't the end of the world over 12 months.
     
  4. OVRA3

    OVRA3 Well-Known Member

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    I've got the smallest leak in my radiator I lose a very small amount over 3 months, trickle almost but I have located the leak and eventually will get a new radiator, I wouldn't worry about it
     
  5. big harty

    big harty Member

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    I've had exactly the same problem with my s3. I found a very very small water leak dripping from my turbo. Didn't even know the y were water cooled.
     

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