What was the ambient temp outside when having the issue? A very common cause is a stuck open thermostat.

The dial on the dash looks like but is not a gauge. It’s more of a 3 position idiot light. Pull up the actual engine temp with the hidden menu (I think it’s 9 ) and confirm the temp gets to and stays close to 90 c. (Might be slightly different on the 8, I have the 6).

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)