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Coolant warning alarm

Discussion in 'A3/S3 Forum (8L Chassis)' started by gash, Apr 29, 2012.

  1. gash

    gash Member

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    I started a thread a couple of days ago saying I had a oil pressure warning come on. Turns out that it was actually a coolant warning.

    To be honest it is a bit if a relief because I was worried I may have done some damage to the engine if it was ran dry.

    Brings me to the next question of why the alarm came on, it was only on for about 20 secs then went off again, not seen it since. Any one got any ideas why this warning came on for such a short period of time?

    Temp gauge is bang on 90.

    I was sitting on a slight hill at the time, could this have caused it?
     
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  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    Check the level of coolant in the expansion bottle...

    <tuffty/>
     
  4. gash

    gash Member

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    Cheers tuffy al have a look tomorrow.

    Any idea why it would come on for a short period then back off again?
     
  5. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    Generally they beep to grab your attention then stay on the dash for a bit... could be that getting onto a flat bit of road was enough to wet the sensor electrodes enough to clear it...

    Gauge being bang on 90 means little tbh... the gauge hits 90 then stays there until something like 100/105 degrees (can't remember the exact number) then throws a warning on the dash and then I think the gauge increase in temp..

    I suspect you r issue is more likely low coolant though...

    <tuffty/>
     
  6. gash

    gash Member

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    Cheers again tuffy, as I said I will check tomorrow and post tge out come.
     
  7. Gops

    Gops 6th gear @7000rpm
    Gold Supporter Audi S3

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    Wasnt there an issue with the coolant bottle level sensor? I had it pop up but coolant level was fine. Put about 100ml in and it went! Comes up on cold days usually.
     
  8. vfr800

    vfr800 Active Member

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    If the coolant level is fine it will be the coolant level sender. (in my experience - it's worse when it's cold)

    Open the cap on the coolant expansion tank, when you look inside there are two metal probes.

    Over time these built up crud/limescale which prevents the sensors from sensing the correct level.

    There are two ways to fix.
    1) Buy a new expansion tank. £15? ish.
    2) Carefully clean the probes.

    I opted for option 2 on my A3 because if I screwed it up a new tank wasn't much and I was about to sell the car anyway.

    I removed the header tank and rinsed it out, I used a long flat-bladed screw driver to carefully scraped down the length of the wires. You can feel when you're removing limescale or down to bare metal. Do your best to clean them off all around. Rinse it out again and refit.

    Liam
     

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