Sorry I must have not been thinking when I answered the question, the fan works as any other car like round town, it turns on and off but on highway when its hot it is always on.

In regards to the sensor being faulty, how could the sensor being faulty only occur on the highway and not around town.

I will check it tomorrow, With the radiator fan, fins are gone!! All broken, lol

Will replace tomorrow. Should be a productive day

- Take out thermostat
- Run without thermostat to see if water pump is working
- Replace new thermostat
- Replace rad fan

See how it goes from there, I am guessing its a flow related issue. So if not head gasket will get looked at.