I was afraid to get N55 due to two things: coolant pump and the belt ingestion.

I DIY on the coolant pump and it was at least 75% easier than on n52 in 3 series x-drive (there's not enough room to get the pipe connected between pump and thermostat).

It is an "all day" job though and swearing though reduced 75% will be part of your day.

Did they have to replace some control ckt or the internal pump ckt failed? I guess the pump has power always so it can run with the motor off to pull out some latent heat.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)