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Weird Temp Gauge issue

ghost.s3 May 24, 2009

  1. ghost.s3

    ghost.s3 Member

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    Hey guys - my temp gauge seems to take a while to heat up to 90. When it eventually gets there, it's bang on the mark. BUT, if I'm driving in 5th or 6th - it just drops steadily. Now, admittedly, a lot of the time I drive the car under boost (gas prices, you know) between 2000 - 2500 - but never so that the engine is labouring. It will drop from 90 down to 60 / 70 in a couple of minutes when I'm in these gears. Is it even possible for an engine to cool down that quickly while driving? Or is my gauge / thermostat just fecked?:sos:

    2001 s3 btw.

    Thanks
     
  2. Westy

    Westy Well-Known Member

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    sounds to me like the common thermostat issue mate, I had exactly the same issues you describe. Get yourself a new thermostat for about £15 and get it changed. The temp should be a constant 90 with a fully functional thermostat.
     
  3. ghost.s3

    ghost.s3 Member

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    Cool - thanks dude. Glad it's not a bigger engine / cooling problem!:salute:
     
  4. evilbow

    evilbow Member

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    mines runs at 60 unless it traffic it raises to 90 but goes down to 60 once driving again
     
  5. voorhees

    voorhees Moderator Staff Member Moderator DSG

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    yes but hes in South Africa and your in Scotland :)

    only joking,yours must be knackered as well.
     
  6. S3 Paul

    S3 Paul Well-Known Member Regional Rep

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    Mine was doing this , Just changed it and now... 90 all the way.
    Its a bugger to get to but if you have plenty of time and some spanner knoledge...
     
  7. Mason-A3Sport

    Mason-A3Sport Audi Sport

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    another common problem, mine does this as well. How do you replace the thermostat?
     
  8. CHARGED UP

    CHARGED UP New Member

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    and mine does it as well, how hard is it to replace??

    Thanks
     
  9. Westy

    Westy Well-Known Member

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    Guys do a quick search and you'll find loads of stuff on this as its soooo common. There's a guide somewhere with pics which I used. Its not that big a job just fiddly.
     
  10. Jack-A3

    Jack-A3 New Member

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    Just did mine this weekend.V easy job. Mine would drop to 60 when moving and i figured it was permenently open.....when i removed it however i found only the top of it remained!!the person i bought it off must have been so tight they couldnt fork out a tenner for a new one and shoved the old lid back in to keep it always open!
     
  11. haugie

    haugie New Member

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    I swapped my thermostat today. I had the same issues as mentioned. I used this guide: http://forums.audiworld.com/showthread.php?p=16925102. This DIY is for a Audi TT, but it worked like a charm for my A3 1.8T. (I didnt have to remove the oil dipstick). Make sure you have some extra antifreeze by hand. I lost about 2 litres while doing the swap. Do remember to disconnect the negative pole on the battery. I forgot and sparkes flew :wtf:
     
  12. S3KO4

    S3KO4 Member

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    Very gooooood guide thank you all, as I have the same issue.
     
  13. boyrollo

    boyrollo Member

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    would this effect the fuel economy as mentioned in my other post my emmissions are all over the place and mechanic reckons the temp sender being shagged would not help?????
     
  14. Westy

    Westy Well-Known Member

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    Yes it will effect fuel economy slightly as the ecu thinks the car is still warming up it will inject more fuel.
     
  15. will_maddox

    will_maddox New Member

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    sounds like the problem im having.
     
  16. New2Audi

    New2Audi Member

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    Same here... :((((
     

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