2005 2.8crd engine coolant water leakage

[cn klt]

Hello All,

I m suffering from the engine coolant water leakage problem... ( vehicle at 95.000km )
I have to add 1 liters for each 1000km.
We have checked/tested the head gasket it is ok

I can not see the the leakage..

could you please help me and share with your advice's?

thanks,