radiator water loss

Ola,
my car loses me water, it is neither of the radiator, nor of any sleeve, nor of the pump, I think it can be of the cylinder head that is cracked, it is also difficult for me to start since this happens,
can anyone tell me something?

If so, how much could a second -hand cylinder head cost me?

BMW 320 TDI Compat E46 year 2002,

thank you very much in advance,

greetings.

Hello.
You say that it is not for the radiator or sleeve, or connections or anything.
Have you tried the heating radiator?
Although it can also be in the expansion vessel.
If it is in the expansion vessel and it is when the car was heated, it could be that a type of whitish foam comes out, which normally means that it is necessary to change butts.
If you change together, the cylinder head is usually rectified, but a new one.
If this cracked, depending on anywhere, you can rectify something, but I do not believe, so recommendation is to put new butts.
Salu2!

Thanks friend I will follow your advice