Have a helper if you have to replace the pump. Use bimmerlink to confirm it's working properly. If it ever stops the radiator fan will kick on full speed. Mine cycled on/off every 40 seconds or so for a week while I was waiting for the parts.

I think you made a correct assessment of your Valvetronic motor and it'll act weird trying to drive past the hard stops until it's trained where they are


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