Hey Zoopa
If it makes you feel any better my wife just came into my work this morning and i think shes done the same to our Hilux.
Can you let me know how much and where you got your head in the end,
i had been driving it for the last 1 1/2 years not a problem

and i was pretty anal about temp gauge and water level to

then i bought an FJ40 two weeks ago

and i swapped cars with the wife, problem is i pulled the FJ apart to do it up

so now shes got her car back and im stuck
Let me know