My problem was...coolant mixture to clear (do not go under 50-50) and bottle cap was completely finish...replaced by a new one...-35 for coolant and the problem is solved...no blocage...no head gasket...just that...thks for all for every body reply my post :)

My problem was...coolant mixture to clear (do not go under 50-50) and bottle cap was completely finish...replaced by a new one...-35 for coolant and the problem is solved...no blocage...no head gasket...just that...thks for all for every body reply my post :)
Oups...sorry for my mistake...I'VE FOUND MY PROBLEM...sorry i'm french and i'm trying to do my best... :)