Hello argenisrv, what you should look at when you fill and purge the air to the circuit, it is to see if it consumes water in the course of a few days, and see if the water and oil are not mixed (you will see it for the color of this, it becomes whitish), if one of these two things happens to you, the button of the cylinder head has been damaged and there will be no other remedy to change it in addition to changing it. of cylinder head. Luck!!!
*It is very important to stop as soon as possible, so that these problems do not happen, if for example. We notice that it does not mark temperature or the cold air comes out in hot position .... the engine may not have water