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?? temp only going to 80 deg

Discussion in 'A3/S3 Forum (8L Chassis)' started by epox, Nov 4, 2013.

  1. epox
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    epox Active Member

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    [Nov 4, 2013]
    hi
    as above temp guage is only going to 80 deg, have replaced stat and temp sensor.... any ideas

    thanks mark
    #1
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  3. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Nov 4, 2013]
    There might be air in the system! Feel the radiator hoses when the car is up to temp an if one is cold (usually the top hose) it means you have air in there stopping the warm coolant getting round to opening the stat.
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  4. epox
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    epox Active Member

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    [Nov 4, 2013]
    hose did feel warm but not roasting .. whats the best way to bleed? did try running the engine with exp cap off..

    mark
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  5. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Nov 4, 2013]
    run with cap off for an hour squish top hose aswell
    if no joy im sure theres a bleed screw somewhere
    i know there is on the b6 and b7
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  6. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Nov 4, 2013]
    Be very carefully with the cap off! Have you seen Andrew@ALD's thread?

    Anyway, cap off, car running, whack your heating on full blast, keep giving the top hose a squeez and the air should work it's way round and out the header tank. You should see the bubbles. Stop once the stat has decided to get up to 90.

    Also I'm assuming you used a stock stat and not one rated at a lower temp?
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  7. epox
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    epox Active Member

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    [Nov 4, 2013]
    ye new stat from audi !! ye did see the thread ! scary stuff....you would think there would be a bleed screw handy some where?
    cheers mark
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  8. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [Nov 4, 2013]
    i forget about the heaters on full
    and as above is it a oem stat or aftermarket
    iv had problems with gsf stats in the past
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  9. eightfour7two
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    eightfour7two Member

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    [Nov 5, 2013]
    Sorry to hijack the thread, but is the coolant temp supposed to rise to 90 and stay there? My S3 tends to sit at 80, but hits 90 after a hard run
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  10. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Nov 5, 2013]
    Supposed to get there and stay there. I it fluctuates then the stat probably needs replacing.
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  11. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 5, 2013]
    You dont need the heater on full.

    No idea why that myth perpetuates round and round the internet.

    The dashboard heat setting does not alter anything to do with the engines coolant flow.
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  12. epox
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    epox Active Member

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    [Nov 5, 2013]
    no luck.... gave the top hose a loads of squeez untill it haw to hot to touch but still sitting at 80, could this be bleed from the coolant sensor point?
    would there be an issue with the pump? had it replaced 1000miles or so ago.

    mark
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  13. epox
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    epox Active Member

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    [Nov 6, 2013]
    anyone?
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  14. kelk11
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    kelk11 Member

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    [Nov 6, 2013]
    i had this same issue after i bought a cheap stat off ebay, replaced with a stat from audi and solved the problem.
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  15. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 6, 2013]
    put the climate control into diagnostic mode and see what it says the temperature is...

    Hold down recirc and press the up arrow
    Display changes to 1c
    use temp +/- control to make the display show 49c
    Press recirc again

    Live coolant temperature will be displayed, you can then drive around and watch what it does.
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  16. hoffmanvp3
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    hoffmanvp3 Active Member

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    [Nov 6, 2013]
    isn`t the green coolant sensor at the right hand side of the head prone to need replacing if your getting funny temp readings?
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  17. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 6, 2013]
    They dont fail as often as folk seem to think, its usually the thermostat.

    In any case, hes already changed it!
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  18. epox
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    epox Active Member

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    [Nov 6, 2013]
    ye have replaced the thermostat from audi, have replaced green temp sensor not audi.

    aragorn are the temps shown taken from the green temp sensor?

    cheers mark
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  19. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 6, 2013]
    yep. But the cluster adds in all sorts of buffering and hysteresis, the climate readout is a unaltered live display of the temperature.
    #18
  20. epox
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    epox Active Member

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    [Nov 7, 2013]
    ok temp on air con only goes to max 75deg . mix of motorway and town driving. any ideas.

    mark
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  21. RobinJI
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    RobinJI Member

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    [Nov 7, 2013]
    I'd stick another new stat in it personally. OEM doesn't necessarily mean infallible. Either that or test what temperature it actually opens at using a thermometer and a slowly heated pan of water.

    It's considered good practice as a lot of cars do control interior heater temperature by controlling the coolant flow through the matix. If you know for sure the car you're doing it on doesn't then fair enough, but it doesn't hurt to get into the practice of it in case the next car you're faced with does.
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  22. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 7, 2013]
    I'd have said the stat is faulty, however you've now said you fitted a fake temp sensor. These can be hit or miss. Stick the original one back in and see how it changes. If it stays at 75c max then the stat is faulty.
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  23. epox
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    epox Active Member

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    [Nov 7, 2013]
    ye will try the sensor ...if that does not work time to whip out the stat.

    mark
    #22
  24. mattyboy199
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    mattyboy199 Active Member

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    [Nov 8, 2013]
    mark

    i have exactly the same problem as you i replaced the state & sensor back in feb, i bought a sensor off ebay so unsure if its genuine or not. Keen to hear how you get on with this as i havent the time to sort it at the moment.
    #23
  25. epox
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    epox Active Member

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    [Nov 8, 2013]
    oem one out the scrappy...... quage back to 90d and ac unit reads around 93... issue seems to be cts.

    still think i have an airlock will run it for a while....aux water pump not running when engin ****ched off.

    anyone know how to change the temp reading on the dash from f to c as i adont know how i managed to change it.

    thanks

    mark
    #24
  26. ticketyboo90
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    ticketyboo90 Member

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    [Nov 8, 2013]
    Never buy cheap **** parts thinking you've saved yourself a fortune. If anything you'll have spent more because the cheap **** will last you a month or two and then you will have to buy the real thing. Don't buy an audi and put cheap tacky vauxhall Peugeot parts on them! Audi'so deserve to be looked after. Wether it's an 80 or an r8.
    #25
  27. epox
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    epox Active Member

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    [Nov 8, 2013]
    ye thanks for the usefull comment....cheers mark
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  28. mattyboy199
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    mattyboy199 Active Member

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    [Nov 18, 2013]
    Did you cure this with a new CTS ?
    #27
  29. epox
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    epox Active Member

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    [Nov 18, 2013]
    ye mate all seems sorted, temp gets to 90 and sits there like it used to.

    mark
    #28
  30. mattyboy199
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    mattyboy199 Active Member

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    [Nov 18, 2013]
    Good I'm going to order a new sensor.
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  31. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 18, 2013]
    What are your symptoms?

    Its almost always the stat.

    The problem here was that he had a knackered stat, then fitted a cheap CTS which was duff.
    #30
  32. mattyboy199
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    mattyboy199 Active Member

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    [Nov 19, 2013]
    I did exactly the same, my stat is a genuine VAG item but my sensor isn't.
    #31
  33. epox
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    epox Active Member

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    [Nov 19, 2013]
    also getting mpg back to what it was...heating up faster= + 3 to 4mpg
    #32
  34. Jersey
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    Jersey Member

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    [Nov 19, 2013]
    Ive been wondering about my temperature gauge for a week or so now. When i have the heater on it doesn't seem to get upto 90, hitting no more than 75-80. As soon as i turn it off. It rises to 90.
    Thermostat????
    cheers.
    #33
  35. buznout
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    buznout New Member

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    [Nov 20, 2013]
    Had the exact same problem. Replaced the temp sensor, no change then the thermostat after which sorted the issue. Weak stat didn't stay closed for long enough so the engine only got to temp after a fair amount of driving.
    #34
  36. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Nov 20, 2013]
    Almost certainly the stat.
    #35
    Jersey likes this.
  37. Jersey
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    Jersey Member

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    [Nov 20, 2013]
    Cheers guys for your help, thermostat on order. Might even try and fit this myself!!! Just looking for a good picture guide, i'm sure there will be one on here somewhere.
    #36
  38. epox
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    epox Active Member

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    [Nov 20, 2013]
    i posted details on the forum last week or so do a search for thermostas replacement.. was from the tt forum but same engine.
    mark..... no matter wats sait you can get to the stat bolts with a 10mm socket and a small ratchet..out of halfords pro socket set.
    Last edited: Nov 20, 2013
    #37
  39. mattyboy199
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    mattyboy199 Active Member

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    [Nov 20, 2013]
    #38
  40. Jersey
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    Jersey Member

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    [Nov 20, 2013]
    Perfect cheers guys
    #39
  41. mattyboy199
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    mattyboy199 Active Member

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    [Nov 27, 2013]
    fitted my new OEM CTS tonight i'm quite suprised this cured the problem & relieved i didnt have to change the stat again. It also cured the hesitation issue from cold. Happy times !
    #40

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