The gauge used to sit and stay spot on 90C, about a week ago I noticed it rising, it got to 110 then started to drop again. I pulled over, switched off and switched ignition back on straight away and strangely the gauge was at 90 (I estimate it should have read approx 100).
Now when driving from cold it seems alot longer to come up to temperature, it will then stay at 90 for a while then start to creep up, at which point I put interior heating on full and open a window and the gauge drops back to 90.
When I stopped with the gauge over 90 the rad fan was on, but it was just pumping cool air out...I suspect no (or little) hot water in rad.
Jonathan
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2003 3.7 Audi A8 (BFL)
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