Boiling up

[flyerncle]

Usually a cooling system feeds water to the bottom hose from the base of the tank and returns through a pipe in the top hose to the header tank that is again usually seperate to the rad.

Beemers have a vent in the rad that must be bled otherwise you get problems with airlocks and overheating.

I have not checked the zetec from the Ginetta donor but suspect it has no stat in the back of the head but it used to run at about 70/75 deg at race speed and no more.

In my years as a mechanic I've done more than my fair share of Rover head gaskets and changed the stat and put two small holes in them to allow the water to flow easier and stop airlocks everytime I did one,this may help.