Tony,
I thought you'd might like to know the temperature gauge still creeps up hence me finding this thread!
Did you ever workout why and correct it as it would save me a lot of time!
No, I ended up changing every part of the cooling system, including viscous fan, water pump, thermostat etc etc, without success. I talked to a lot of BMW specialists who said it was probably a gauge problem, and not to worry. Never got round to getting a different gauge to test.
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