I believe the same instructions for the 6 cylinder applies to the V8 aux water pump. You can get it to run to bleed that section.


Otherwise, my normal go to is:
Fill system as much as possible.
Idle engine, heat on, high temp, low fan. Leave expansion tank open and keep topping up.
Near operating temp I put the lid on. Do a quick neighborhood test drive.
Next morning top it up.




I had to replace both the auxiliary water pump and heater control valve two years ago so depending on your year/mileage those could be suspect.

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'08 X5 4.8i - 190k
'15 i3 - 95k - Blown AC compressor

'98 323is - 170k - Garaged
'94 325i - 208k - Sold