Its not Bosch but it might help.
Source: https://www.youtube.com/watch?v=wLIJ_9Ercms&list=PLHJZ2jPhTMKf0VC7-s1bSBLSXSLI3qMav
That is exactly what I needed to hear, I totally forgot about the t stat closing that off.#2 would depend on the thermostat position, closed it recirculating the coolant back to the pump, open or blocks the tube forcing most of the coolant to go towards the radiator.
Should be some flow, but I doubt as much if it was dumping into the low pressure side of the radiator
Normal #2 is part of the turbo coolant circuit.. which I can't remember which way it flows