Hi Pablo, looks like your missing the steel section of hose,
This joins onto the lower radiator with a short piece of hose, then goes around the back of the exhaust where it joins onto rubber hose from water pump.
This is exactly what I am missing. Thanks for the information!
Setup I posted works fine with 36.5C heat we have in Poland at the moment but I will hunt for that OEM metal pipe. The rubber can take only certain amount of abuse.