2001 F350 with 105K miles on it. Haven't been driving it much, but have noticed that the fan clutch always seems to be on. Seeking insight to see if this condition is a "fail safe" condition, or not. Appreciate any insight. Plus, if you had to have your fan clutch on your 7.3 liter powerstroke replaced - how much was the part, how much for labor? If you replaced it your self - please provide insight - easy, difficult - wished you would have taken it in. In advance - thank you.