Sounds like a mini diesel engine hiding under there - I’d probably add a bit more coolant when you are bleeding - any other leaks in the system? The N63 cooling circuit for the turbo lines have 2 bleed screws on the top of the engine that I had to crack open with the engine running in order to bleed the auxilary cooling circuit as the self bleed pump couldn’t get coolant all the way to the top of the engine (maybe its a bit tired after 100000km). Until I did that I had all sorts of funny loud Spinning impeller noises as the pump was surging as it was loaded/unloaded with fluid.


2012 E70 5.0iX