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Engine Temperature

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Murton, Aug 19, 2014.

  1. Murton
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    Murton Member VCDS Map User

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    [Aug 19, 2014]
    I have a 2006 A3 2.0 TFSI which I bought just over a week ago. What is the normal engine temperature?
    Mine is staying at about 75C and is pretty quick to get up to that temperature. My old A4 with the same engine used to stay constantly at 90C.

    I left the car idling for a while and the temperature did not change but the radiator fans were turning slowly. I know that the radiator is kept at a cooler temperature with the aircon on so I switched it of and the temperature went up to 90C. I took the car for a drive along a dual carriageway and the temperature stayed at 90C. On the way back I switched the aircon back on and it went down to 75C.

    Is this normal or is the thermostat faulty and opening slightly at 75C?
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  3. s3facelift09
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    s3facelift09 Member

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    [Aug 19, 2014]
    I presume you are talking about water temperature, for wich there is a gauge in the instrument cluster. The needle needs to be at 90 degrees and not 1mm left or right when engine is warmed up. I think that your thermostat is faulty, but to ensure that it is, you need to connect your car to a VAG and see. I changed the thermostat on my S3 a year and a half ago, and when it was faulty my temp. gauge was showing around 86 degrees and this wasn't a big problem,but 75 is too low, and you should solve this problem A.S.A.P. The thermostat at the dealers was something around 45-50£ without labour, you should also change the antifreeze while at it, I'd go with the new long-life G13, you need 2 cans of it, 2x1,5L and that shouldn't be more then 20£ ..
    Last edited: Aug 19, 2014
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  4. JJ.Foulds
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    JJ.Foulds Well-Known Member

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    [Aug 19, 2014]
    no thats not normal to be showing lower than 90 , however it is normal for the engine thermostats to need replacing in these engines.
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  5. Murton
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    Murton Member VCDS Map User

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    [Aug 19, 2014]
    Thanks. I will speak to the garage I bought the car from as technically it is not covered under the warranty because it existed at the time I bought the car.
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  6. T8DPR
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    T8DPR If Carlsberg Made Audi Drivers...

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    [Aug 21, 2014]
    my old bora used to be the same and the garage said "some temp gauges just read differently"

    it'd only hit 90 if I'd been in it a while and stuck in traffic, as soon as I was at 30mph or more it'd drop just below empty

    thermostat off ebay for about £7, changed it myself, lost a load of coolant cos I'm a clutz, topped it up tho and took it for a drive, sat perfectly at 90c

    if its in an easy enough location to get at and change it, the thermostat really isn't a costly job, even if you don't go cheapo ebay
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