85 245 turbo intercooled temp gauge usually is pinned at the 9:00 position...But recently it's been different.. In traffic and at slow speeds it stays at 9:00 but at highway speeds in climbs to 10:00 but then recovers when slowing done or stopping and brought to an idle. New Radiator, thermostat, fan clutch and waterpump (No Leaks) are 4 years old with about 40,000 soft miles on the car... Now the reason why a I ask before I start throwing money and time at this I would like to if possible narrow things down. My feeling is it might be a failing fan clutch.

Thanks All