Hi
As the title says, i have a over heating problem with my 3.0 V6.
From cold it takes approx 5-6 miles until it is overheating (the needle goes off the gauge

)
So far the work i have had done to it is as follows: new thermostat, flushed radiator and fresh coolant (obviously)
The car isnt loosing water from anywhere and the oil cap is clean.
I am at a total loss as to what the problem could be :-?
Any help is much appreciated. Regards Bob