AT last i have owned my sportrac for nearly 4 years and in that time it would over heat if i used motor ways but ok on A & B class roads? and to cut a very long story short including reading all the posts on here it has turned ou to be the thermostat only partly opening up now i have changed it with the correct thermostat asit turns out 3 different ones listed buit now it a sorted and can thrash up and down the motor way untill i blow the engine up!!!