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Temp gauge changed - Still not working - Need scanning? Anyone in Guildford/Surrey?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by NathanA4Avant, Nov 17, 2012.

  1. NathanA4Avant
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    NathanA4Avant Member

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    [Nov 17, 2012]
    Hi all.

    Been having problems with my temperature gauge not working at all since I bought the car.

    First thing I did was put a new genuine temperature sensor in the rear of the engine - no change.

    It was suggested that you can change the temp gauge and not the whole dash unit - so I got one on eBay and just finished swapping the temperature gauge over. Turned the car on and still nothing recorded on the temperature.

    My car has been serviced twice in my ownership, and the first time it came back with the dash displaying 'DE'F where the trip mileage is. This wasn't present when i bought the car.

    Do you think the dash 'thinks' its still buggered and hence decides not to try reading a temperature? Would scanning it help at all? The 'Check' button runs through and gives me 'OK' on all the systems, but i know you can do a needle/clock check on VAGCOM. Would you recommend this as the next step? Could i be missing anything else out? Would it be a wiring issue?

    Help appreciated and if anyone close to Guildford wants to scan my car PM me and we can talk.

    Cheers, Nathan.
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  3. stu_m
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    stu_m Well-Known Member VCDS Map User

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    [Nov 17, 2012]
    have you tried changing the stat? could be stuck open so not warming up at all

    failing that i would say its a wiring problem
    #2
  4. NathanA4Avant
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    NathanA4Avant Member

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    [Nov 17, 2012]
    Stu, how easy is it? engines a 2.0 FSi. Would a knackered thermostat give no reading at all on the gauge? Its never moved from cold.
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  5. stu_m
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    stu_m Well-Known Member VCDS Map User

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    [Nov 17, 2012]
    I dont know where the stat is located on the 2.0 but I cant see it been hard

    yes a stuck open stat could cause it to stay cold and not move

    but do you get heat in the cab? do the heaters warm up pretty quick say after about 5 - 10 mins? if so then the stat could be fine
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  6. NathanA4Avant
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    NathanA4Avant Member

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    [Nov 17, 2012]
    I get some heat - takes forever to warm up - probably 15+ mins before you notice it, but it does get there eventually. Its surprising none of the Audi dealers/specialists have mentioned it could be the 'stat.

    I know on the TDIs you have to remove the cambelt etc. Its probably one of those jobs that cost £600 for a £20 part. :(
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  7. stu_m
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    stu_m Well-Known Member VCDS Map User

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    [Nov 17, 2012]
    its only on the 2.5tdi you have to remove the belt

    the 1.9 is easy

    when you say some heat is it a case of it gets luke warm and thats it or does it get pretty hot?

    personally I would change the stat just to rule it out
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  8. NathanA4Avant
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    NathanA4Avant Member

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    [Nov 17, 2012]
    Ah ok. I might grab one in the week and have a go next weekend. Its gets warm but not hot-hot. My mates old peugeot would dry your eyes out in a matter of minutes but mine never seems to warm up enough.

    I will get the bits and swap it over and see if it changes.

    Cheers.
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  9. stu_m
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    stu_m Well-Known Member VCDS Map User

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    [Nov 18, 2012]
    petrol engines always warm up pretty quick compared to a diesel and my 1.9tdi will warm up to 90°c in around 15 mins and heating is red hot!
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  10. renorti
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    renorti Member

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    [Nov 18, 2012]
    change the thermostat, as mentioned by other members, cheapest option to try first, even if it's stuck open would expect the gauge to move ,even when ticking over ? also check radiator hoses are both hot , if is cooler than the other could point to circulation problem.
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  11. NathanA4Avant
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    NathanA4Avant Member

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    [Nov 25, 2012]
    Just a quick update, thermostat is on order. Its not cheap - £63!! Its the fancy electronic one apparently? Anywho, its on order so will get it fitted at the weekend. I still think it needs scanning. DEF on the dash suggests its just a dash error no? So scanning it and clearing the fault may 'wake' it up again? Anyone want to scan if for me?
    #10
  12. beachbuggy
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    beachbuggy Well-Known Member

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    [Nov 26, 2012]
    I'm in Guildford. Pm me
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  13. NathanA4Avant
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    NathanA4Avant Member

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    [Nov 26, 2012]
    PM'ed!!
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