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Coolant Warning

Discussion in 'A3/S3/Sportback (8P Chassis)' started by w7 abs, Dec 20, 2011.

  1. w7 abs
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    w7 abs Member

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    [Dec 20, 2011]
    My coolant warning light keeps coming on in the morning. I've checked the coolant level and thats fine. I will pop into a local garage to get them to check the mix but wondered if anyone was getting a similar problem. Its a 2.0 T quattro.
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  3. DaveyB
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    DaveyB No misfires.

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    [Dec 20, 2011]
    What year? Has the coolant ever been changed as far as you know?
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  4. w7 abs
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    w7 abs Member

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    [Dec 20, 2011]
    Its a 2006 with FASH so thought they would have done as part of standard service, but don't know for sure.
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  5. Legend7
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    Legend7 Member

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    [Dec 20, 2011]
    Yes happened to me also in the last few weeks. Although the coolant levels looked fine. Just top it up a little with the coolant not water and it will be fine. Must be something to do with the cold weather ;)
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  6. DaveyB
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    DaveyB No misfires.

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    [Dec 20, 2011]
    Did mine 2 weeks ago and made sure the concentration was good and strong; -20 degs below C is what you are after really on testing, anything less I would suggest a flush & change. First port of call! Mine was a few degs off but only got a warning once the reservoir was empty on 1st stage ignition.
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  7. w7 abs
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    w7 abs Member

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    [Dec 20, 2011]
    Thanks - I will try topping up tomorrow and see if it cures it. I've got to get the brake pads changed after christmas so may get them to flush and refill when its in, to be safe though.
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  8. FranA3
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    FranA3 events moderator Regional Rep

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    [Dec 20, 2011]
    i read somewhere before that the prongs in the tank get scaled badly like a kettle does so give them a clean first i think its the two prongs that go into the coolant but not 100% sure on that
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  9. cloughy
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    cloughy Member

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    [Dec 20, 2011]
    Mine only had a service a month ago when coolant was changed, I get a coolant warning for a few seconds on a cold morning sometimes, very bizarre!
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  10. DaveyB
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    DaveyB No misfires.

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    [Dec 20, 2011]
    I have had the coolant warning on the Merc and a top up of neat coolant has sorted it. Even garaged cars need regular changes too! Even more so than daily drives...
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  11. SWILKO
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    SWILKO Member

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    [Dec 20, 2011]
    Hi Abs.

    I also run a Golf Anni PD 150, had it for 7 years. I get the same thing every winter, has done it for years. Coolant never low and has never been topped up. As soon as the car has idled/ driven for a minute or two the alarm dissappears after restarting the engine. I've got to the stage where I dont even boher about it but at first I was panicking. Not saying your car is faultless but like previous posts say it may be a sensor issue.

    Cheers,

    S
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  12. flying oyster
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    flying oyster flying oyster

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    [Dec 21, 2011]
    i think its a common fault in winter mine does it as soon as the cold weather starts then it dissapears i still check it though lol
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  13. Dannykn9
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    Dannykn9 "Cruise My Ride" VCDS Map User

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    [Dec 21, 2011]
    The problem is your sensor rods in the coolant tank. They have become rusty slightly sending a false signal.
    This happened to me and many others, has been covered a number amount of times.
    Do not go to audi they will charge around 250 for diagnostics parts and labour!
    New coolant tank is only 26 quid plus another 14 I think for there coolant.
    Easy to fix job!

    Hope this helps
    #12
  14. FranA3
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    FranA3 events moderator Regional Rep

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    [Dec 21, 2011]
    thats what i was on about in post number 7 matey knew i had seen it before somewhere
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  15. Dannykn9
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    Dannykn9 "Cruise My Ride" VCDS Map User

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    [Dec 21, 2011]
    And for a minute FranA3, I bet you were going mad!! Lol
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  16. cloughy
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    cloughy Member

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  17. Cruiser89
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    Cruiser89 Advanced In Car Tech Site Sponsor

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    [Dec 21, 2011]
    My old 59plate A3 did that. Took it to Audi and they said it was a fulty sensor. So replaced it under warranty!
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  18. N8
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    N8 Kowalski Details VCDS Map User

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    [Dec 21, 2011]
    My car hadn't moved for about a week, and when I started it up the other night it came on in the DIS. I checked the coolant and it was perfect. IIRC it was changed in the summer when it had a major service @ Audi. I may just change the coolant and also the tank for that money for peace of mind. Thanks for the advice Danny! :wub:
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  19. Dannykn9
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    Dannykn9 "Cruise My Ride" VCDS Map User

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    [Dec 21, 2011]
    No problemo N8, glad to be of help.
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  20. Dannykn9
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    Dannykn9 "Cruise My Ride" VCDS Map User

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    [Dec 21, 2011]
    Even cheaper than when I bought it. Happy days!!
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  21. w7 abs
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    w7 abs Member

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    [Dec 25, 2011]
    Hi, thanks for all the replies. I've topped up an no warning, but also no cold weather!! Is there a way of cleaning the sensors or is it just a matter of replacing the coolant tank as it looks a nightmare job to get out.
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  22. Dannykn9
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    Dannykn9 "Cruise My Ride" VCDS Map User

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    [Dec 25, 2011]
    For what it costs mate, just replace the tank!
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  23. actionslax
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    [Dec 26, 2011]
    Mine has been doing this also. It started when it got really cold. Done all the checks and everything looks fine. The light disappears after a few minutes and doesn't come on at all sometimes. Hopefully get it in on the 4th to get sorted. By the sounds of it, it is a common issue, I take it is ok to drive say on a longer journey?
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  24. Dannykn9
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    Dannykn9 "Cruise My Ride" VCDS Map User

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    [Dec 26, 2011]
    Totally fine to drive mate, but to be on the safe side, I would check your coolant every so often, just to be sure.
    Unless your car is under warranty then I suggest you try to change yourself as it is an easy cheap fix.
    #23
  25. w7 abs
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    w7 abs Member

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    [Apr 2, 2012]
    Thanks everyone, I finally got the bottle changed and no problem for 2 months even when it got really cold. £20 inc top up so can't complain at all. It took us @ 5 mins and most of that was waiting for it to warm up again to check for leaks. Far easier than I thought it would be, apologies Mr Audi designer.
    #24

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