Aporte original por: Goran ,
The reason is a bug, implementet by Apple in system 10.4.4, not fixed. Read my "bhu bhu Apple - thread". I beleive it is a "bug" by purpose, to keep temperature down, so not the liquid do expansion - with leak of the cooling system as an result. Obviously the leak normal is in the plastic material in the pump area, wich indicate pressure-reason behind it.