This is perhaps old hat to a lot of you long term X5 owners, but I found it very cool that you could use the auxiliary cooling/heating pump to bleed the cooling system. Just turn on the ignition, turn the heat up and let it go for a few minutes. Remove the resevoir cap and you can see it circulating the coolant and sucking it into the system.

Probably still better to use an Air-Lift pressurized filling system, but I still find this whole auxiliary cooling/heating thing pretty cool.

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp