Seems like coolant thermostat to me. Have you ruled out the temperature sender?
On the A2 (3 cyl) TDi these were common failures/easy enough to replace. I replaced mine as a preventative measure, along with the coolant thermostat (that had failed).
I'm guessing on the 8 things aren't quite as simple
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
Last edited by Johnmed; 25th May 2015 at 07:38 AM.
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