While sitting idling (only for a few minutes), fan kicks in and the temp gauge shoots right up :( Its happened twice now) Checked coolant level both times, and it was low and had to be topped up. Took it into bmw the 1st time it happened (4 weeks ago) they checked it over and said they couldnt find anything wrong.
It happened again at the weekend, exactly the same senario. Also a kind of sporadic knocking noise coming from the engine bay somewhere since this happened? Any clues as to what could be causing this? :(