First of all sorry for not replying for some time.
Just a note, this car was bought on second hand, so I don't know if the car ever had this problem from the beguining or not.
My first thought was to check if these cars are known by these problems. From the forum and other reasearch I found more people compaining about it, but it doesnt appear to be a common problem. I found it weired although that on the 2002 version the engine was replaced to another one. Mine is the Mazda engine, but after 2002 it's from another brand (can't remember if it is from Peugeot or other brand). I thought weired to have an engine for only 2 years... but maybe it's just like that. The radiator is clean and it has no leaks, it was replaced the cooling liquid. I haven't checked although the tension on the small belt that drives the radiator fan. but since the radiator fan was replaced... I believe that it should be good. The car is beeing used everyday with no problem, but If I go to a long trip... for sure I'll have this. I'll updte if I can find anything. Neither Suzuki can discover... they say "everything appears to be good"
Thanks for the help so far