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Water/coolant temperature problem

Discussion in 'A3/S3/Sportback (8P Chassis)' started by A3Bash, Jul 9, 2011.

  1. A3Bash
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    A3Bash Member

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    [Jul 9, 2011]
    My 2008 S3 water temp seems to drop every now and then after it has hit 90 degrees. Even after a long 1 hour drive on the motorway the temperatue just slightly drops and then slowly goes back up. I've put it on a VCDS and there aren't any sensor faults. Any ideas? Thanks
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  3. Geraldy212
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    Geraldy212 Sportback owner

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    [Jul 9, 2011]
    Bash, it sounds like a sticking thermostat. This is a mechanical device, so would not show up on VCDS. I don't think that the thermostat element is too hard to get at, and probably does not cost much to replace. Good luck.
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  4. audicruiser
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    audicruiser Audi Heaven

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    [Jul 9, 2011]
    As above, thermostat for definate... Has the same on my old Golf MK4
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  5. A3Bash
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    [Jul 10, 2011]
    Thanks for the replies, will have a look!
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  6. paddy
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    paddy Audi=No fault code, no idea

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    [Jul 10, 2011]
    After an hours drive on the motorway it is quite reasonable for the thermo to shut and reopen. All it is doing is maintaining the temp at 90. Sounds to me like its doing its job.

    If however the temp was not being adjusted back to 90 then i would see that there was a problem
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  7. audicruiser
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    audicruiser Audi Heaven

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    [Jul 10, 2011]
    My temp guage never moves from 90 though, where as when the thermostat went on my Golf it would drop back etc.... Does yours move then Paddy??
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  8. Geraldy212
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    Geraldy212 Sportback owner

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    [Jul 10, 2011]
    The thermostat will regulate the temperature very accurately. No more than a whisker of movement on the needle. If you are seeing a difference in temperature, it's the thermostat which is not providing the usual fine control of temperature that we normally expect. Suggest you replace the thermostat and see the difference. Not expensive, but of course not a major problem also.
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  9. paddy
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    paddy Audi=No fault code, no idea

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    [Jul 10, 2011]
    To be honest, well yes it does but only by the thickness of the needle. In traffic it will drop by more when the fan cuts in. the V6 has 2 rads and 3 fans so maybe its a bit more sensitive ? :)
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  10. A3Bash
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    [Jul 11, 2011]
    This is my fourth audi in recent times and it's the first time I've seen it happen. When it moves more than the needle width it's a problem I think.
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