Refrigeration problems of 406HDI110CV

I have problems with the cooling circuit of the Pergeot 406HDI, the circuit pressure rises a lot and when purging it, bubbles do not stop out of the bottle that must be placed for that purpose. Mark the light of the water level and when looking that at the level but I think it is because I have the circuit with tap water and it is avaporated by the valve of the cap of the expansion vessel because it does not lose anywhere visible.
what can it be? a motorcycle machine or a problem in the cylinder head

These systems are with pressurized deposit if I am not mistaken there are 2 things. If the thermostat is not failing you, the cooling system in the Ford systems can be failing. direct the fans so that they do not warm instead of repairing the problem and then people complain that the vehicle spends too much fuel because when it does not reach the normal operating temperature the computer believes that the vehicle is too cold and sends more fuel. It could be that one of these is your problem because I am not very familiar with this vehicle brand.

Thank you Choto for your wise advice was what I wanted to hear, but I did not believe that it could evaporate so much water, in a 4KM path it loses almost a liter of water but does not make puddles or it looks to drip anywhere.
And changed a motorcycle from the motorcycle to see if it jumps before and does not evaporate so much, and thus fill it with antifreeze, because the probe is changed to one of scrapping to try but continue in them. I will tell you and thank you again spent or invested, as you look, in this almost my existential problem because I even dream of it.

Hahaha the nightmares are normal for mechanics, if you spend a lot of water as you say, and not the boot is the cylinder head, for the same reason is that you always see air in the bottle that indicates that the compression of the cylinder is passed to the cooling system.

But then bubble once every cycle is to say continuously? This loose bubbles every 20seconds more or less and smoke is not at all white only at the beginning, but because of the heaters. I hope it is what Choto said because that was what I didn't want to hear in dreams. Thanks for your time and before the butt I am willing to inspect something else but I am very much in mind