Thanks for your new directions and support Davidvan and Colinken.
Wife forced me to go buy Christmas stuff!... Yeah... Christmas coming... like I don't have enough problems...

:-(
While out of Maputo I have sent an sms to the mechanic asking him if we winning. He said problem fixed but oil leaking from a cylinders head. So he had to go back and change that gasket and so on. BUT, he said, engine does not overheat anymore!!!
Got back and assisted to gaskets installation and all the engine up to the last head and screws. Tomorrow they will finish at 12.00...
I will get back to you. But honestly, I become very pessimistic already!
But let's see... sometimes good things happens in Christmas Eve!
If the engine will overheat again it should be a radiator problem for sure. In that case I will take on this road! No way to send the car back! I have seen the engine today, the cylinders heads look like new... changed gaskets, heads, water pump and its become one of my most wanted car ever!
See you tomorrow evening.