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Coolant warning light playing up

Discussion in 'A3/S3/Sportback (8P Chassis)' started by immo, May 31, 2013.

  1. immo
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    immo Stop me

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    [May 31, 2013]
    Sometimes when I start the car the "coolant level low" light comes on the dash, but when I check under the hood it's fine and hasn't moved. Turning the car off and on again solves the problem until next time.What could this be? Some sort of faulty sensor?
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  3. NHN
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    NHN Retrofitter - Audi - VW - Skoda - Seat Site Sponsor VCDS Map User

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    [May 31, 2013]
    Grab a flat headed screwdriver, open the coolant reservoir, making sure its not boiling hot, scrape the 2 prongs a bit & then see if it returns.
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  4. immo
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    immo Stop me

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    [May 31, 2013]
    Scrape the prongs whilst they're in the tank? As can't see a way of taking them out. The coolant is also well above the max limit, is this an issue?
    Last edited: May 31, 2013
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  5. Turbo jay
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    Turbo jay Leather repair specialist

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    [May 31, 2013]
    Yea whilst there in the tank, I had the same issue over the winter and this solved the problem, seems quite common on the 8p.
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  6. NHN
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    [May 31, 2013]
    How far above the max line, pics would help, but is this when cold or after usage?
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  7. immo
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    immo Stop me

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    [May 31, 2013]
    Well it's over half way up the tank, whereas the max limit is more like quater way up I think?

    I do believe it's regardless or whether it's been run or not but I'll confirm in the morning before I go to work, along with a picture. I'll have a go at scraping the top of the prongs as well.
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  8. dk1234
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    dk1234 Member

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    [May 31, 2013]
    Yep, when the engine / coolant is cold just use a screw driver or something to scape them by putting the screw driver in the hole with the lid off. I had problems with my coolant and this was a regular suggestion that solved the issue for many people in the past. The sensors in the bottle send a signal to the car's computer to tell it if the coolant is low, sometimes they get a build up around them and then the sensor plays up. that's why people suggest trying to clean them with a screw driver first.

    If that doesn't solve it, you can get a new coolant bottle for about £20 - £30 from Audi, I bought one to replace mine but I can't remember the price of the top of my head. If you get to that stage it's not that hard to fit it yourself.
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