Hi John.
Welcome to Ford Forums
Not sure of your mechanical experience ?
Here's a Link to Tech Resources ....
http://fordforums.com.au/wsmpub/augx/Part%2011-1.html
Go to 11-1-5
Be mindful that you 'MAY' need a new thermostat, hoses and a new overflow tank cap, depending on the history of the car.
Any questions, feel free to post back.
All the best.