What kind of garage is this? Don't they have ISTA+ as an option to do a bleed routine?
Is the car in "eco-pro" mode? Move to "comfort".
https://f30.bimmerpost.com/forums/sh...93&postcount=5
From that link:
"The electric pump is very quiet and sounds a little like varying tones like what you'd hear during an ear test. Make sure your radio/music is off so you can hear the pump running.
The battery needs to be on a full charge, or connected to a wall charger because the process won't start if the battery voltage is too low.
Don't open/close windows/doors/etc.
Push the ignition switch without pressing the clutch (accessory mode).
Left the headlight switch in "auto" (no hazard lights).
Left the driving experience mode in "comfort" (switch is NOT in the ECO PRO switch position).
Turn off the auto climate control (important!), and adjust the heating to maximum temperature (28C) and adjust the fan to the lowest level.
Floor the accelerator pedal and hold for 10 s.
The automatic cooling system bleeding routine will be initiated. The electric coolant pump is enabled.
The engine will NOT start.
Process lasts for 8-12 minutes and when finished the tones will stop and the car will be VERY quiet. No notices on dash or screen before/during/after.
The engine bay can be open/closed (doesn't matter), and the coolant container caps can be open during the procedure to verify fluid circulating or to top up."