Can anyone tell me which way does the coolant flow in M10 BMW engine?
Here is the photos of all of the hoses:

http://www.realoem.com/bmw/diagrams/b/e/7.png

I (think that I) know that it flows to the radiator trough the hose 8
and from the radiator trough the hose 9.

What I want to know is which way does it flow with thermostat closed. I
need to know that because I am fitting LPG vaporizer that needs to be
heated. I think that the best way is to use coolant from the engine to
the inlet manifold before it goes to the cabin heater.

But should I cut hose 19 and connect vaporizer in series there, or at
hose 15? Is coolant going out of the engine at divider (1), or at the
pump (hose 13).

There are two more hoses:

http://www.realoem.com/bmw/diagrams/e/e/18.png

One from the inlet manifold to the cabin heater, and one from the
engine to the cabin heater. I guess that these is not hoses I should
consider.

What I need is good good circulation, and as high temperature as fast
as it can be.