i have the same problem on my 5er, not that bad, but it definitely wants to go close to red zone whenever i am stopped for more than a few minutes... water pump, gasket, fan clutch all have less than 30k on them and it still does it. i guess the next stop on my list is the thermostat...
the thing is when you are moving, the air is being pushed against the car thus cooling it. i also have a feeling that my fan doesnt spin at idle at all, because when i rev it when it starts to overheat, the temp drops.
good luck figuring it out. i'll tell you if thermostat replacement/ fix helps as soon as i get a chance to mess with it.
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