Do the A8 TDis have webasto heaters? My old A2 did, the later models had auxiliary electric heaters.
If so, that's completely normal behaviour for a webasto. Or maybe I'm barking up the wrong tree.
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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.
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