KIA PICANTO 2005 - HEATING

How about friends of the forum.
I have been experiencing some problems with a Kia Piccanto 2005.

It turns out that steam begins to be extended through the air grilles and the cabin is moistened.
After that he has definitely heated the car and turns off. You have to be reviewing the water from time to time, but where this is forgotten. Obviously after you throw water and half cool, then light and everything normal. What can it be?
I say that it is the thermostate and the hose, but why does the cabin moisten? Do you have any other idea what can be? A manual to repair this?

Thank you very much in advance.

If you get steam through the habitaculus grilles, you may have the heating radiator chopped and loses water there, so you would have to look at it and if it is wrong to change it. The engine is heated because the water loses and boils when the circuit from the entire engine is taken air. It is not good that you add more than half a liter of cold water when the engine is hot. Greetings!!

Friend!!! It is undoubtedly the heating radiator that broke. I explain you; A part of the refrigerant that goes to the engine is deviated to the heating radiator ... Here in Venezuela it is eliminated ... an U aluminum tube is placed with some clamps to the two pipes that go to the heating radiator and voila. Place an insulator to the pipe radiator pipes that are discovered to prevent the heat from the motor to the habitaculus.