Hey Joypower, yes, chargecooler replacement solved my problem...

Make sure you buy yourself intake manifold gasket too, they are pretty fragile, at least mine was!

Good luck

Thanks for your answer @yomarkina

Any symptom of loosing coolant by the valve at the expansion tank beside the coolant going to the minimum?

In my case no, at first I was thinking I am loosing that way, but, later on when I was inspecting it more, it wasn't the case...
If your car is spilling it out of the closed expansion tank, your problem could be with heat matrix core in cabin... But just to be sure, try checking both the chargecooler and egr cooler too...
Those are 3 options you can firstly try, and also the cheapest possible cases...
Oh, yes, I almost forgot, you can try putting a new expansion tank cap, from friends car or something like that... 
This is some begininng notes I can give you...