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Coolant error

steve184 Nov 28, 2011

  1. steve184

    steve184 Active Member

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    This morning when i started my car, i got the red coolant error come in in my DIS. I immediately stopped and physically checked the coolant level under the bonnet and the level was where it should be. The error had cleared by the tie i had closed the bonnet and got back into the car.

    Any ideas what this might be?
     
  2. BigBird

    BigBird Lost in music...

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    Temporary airlock? Or the sensor probes on the expansion tank on their way out? This kept happening to me with my old Golf mk4.

    A replacement expansion tank including the probes was under £20 & a cinch to fit. Cured the issue.
     
  3. steve184

    steve184 Active Member

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    Do you have to replace the whole expansion tank? Presumably you have to drain the coolant system too and refill afterwards?
     
  4. c_w

    c_w Well-Known Member

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    Trying putting a bit more in, mine has done this on and off recently but *seems* to have stopped when I went beyond the tank seam.
     
  5. BigBird

    BigBird Lost in music...

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    The tank comes complete with the probes built in. I just lowered the coolant level by removing any fluid in the old expansion tank with a syringe, then swapped the tanks over and topped the fluid back up. Really easy.

    This obviously came after a few weeks of getting the DIS message and checking the fluid levels all the time.
     
  6. steve184

    steve184 Active Member

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    Bit odd - why would it think the level was too low - if it was indeed between the markings where it should be - don't want to overfill it as this can cause leaks to develop can't it?
     
  7. c_w

    c_w Well-Known Member

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    I know - it may be coincidence but it hasn't come on again, I filled it up to 3/4 with some anti freeze.
     
  8. Baffles

    Baffles Active Member

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    Had the same issue a few weeks ago - Audi ended up replacing the coolant bottle and sensor as they were faulty.
     
  9. mikejclark

    mikejclark New Member

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    I read on another post to scrape the prongs inside the tank with a screw driver. it seems a build up of something on the metal breaks the circuit fooling it into thinking there is no coolant. worked for me anyhow
     
  10. dantdi

    dantdi ...

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    Had this problem myself this morning. so just cleaned contacts on probes.
    Hope thats sorted it.
     
  11. Virdee

    Virdee Active Member

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    As many have said you can clean the contacts or replace with new tank to cure the problem. New tank ain't that expensive anyway. Circa £25. Plus you get the added bonus of a clear new bottle!
     
  12. Silky-S3

    Silky-S3 Is loving his new 8V S3!

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    I used to get this every winter with my old A3, only when it was cold. I think its just a sensor error/being slow due to the cold. Never happened when warm.
     

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