Yes you are right, though it's a not the a "main" part of the cooling system it may probably cause your temperature trouble... Had a similar issue on my 530d (M57): the thermostat of the EGR was the cause in that case.

Interesting, thanks for sharing your experience!

I took a gander at the analog values in INPA and I noticed the rad outlet temps are really low, around 65-70c, even with Ktemps at 96-97c.

Then when Ktemps start to go down, rad outlet temps go up to about 80 or so.

It does seem to point to the thermostat, but it's new.

WTH!