View attachment 453236
The weirdness seems to come with why is the intercooler there? Then you realise that expansion tank has 2 fillers...and is indeed split in half.
So we have 2 separate cooling systems, The engine block is cooled by a conventional cooling system with a conventional water pump. The intercooler and the water cooled turbo have their own dedicated coolant circuit with an electric independent pump which possibly explains the slightly odd placement of the intercooler being half way between the turbo, the expansion tank and the inlet valves.