his fan is hooked up that it comes on at start up, like my truck comes from the factory, so his fan is always on...he's also already replaced his thermostat...

i just thought about replacing with a lower degree thermostat if you havent already done that. but when you should flush your coolant though, bleed the system, replace thermostat (just for piece of mind, thats how i roll), put a fresh radiator cap on and you should be good