Antifreeze in tsuru lll oil

Auto Tsuru 2006 The antifreeze to the oil was passed and 5 months ago the head board the fault it presents is that when removing the cap from the cold radiator and full of antifreeze when the engine the engine the antifreeze is empty to the carter does not boil like when the head of the head is damaged, it will be the distribution cover or that something else can be thanks greetings.

And already replaced the board ??

Most likely to have the burned joint