Already bought a new housing for it richiemax,thats what i couldnt understand because it was still leaking.I took out the new cheappy thermostat which cost a fiver and tested it to see if it worked,would you believe it ,it was a duddddddd,went into ford kicking and sreamming lol and got one there.....since then its been bone dry.Thanks again everybody for the advice,hopefully thats the end of it.