Coolant leak up front

[B328iC]

Drain from the block drain plug too

Will that drain the expansion tank or do I need to remove it and drain it out the top?

[Nanniepoo]

Will that drain the expansion tank or do I need to remove it and drain it out the top?

It'll drain it. You won't get everything by just doing the rad plug.

[Nanniepoo]

It'll make a mess though so be prepared.