Where is the clutch fan located in my 98 pathfinder?

If the fan is belt driven the center pulley would drive the fan. the clutch would at the center of the fan and fastened to the pulley. Would be silver with fins on it at the center of the fan.

If it is electric (there may be models with electric fans) there would be no belts driving the fan. instead an electric motor at the center of the fan would do the driving. more horsepower due to parasitic load on the motor, but electric motor do seize up.

I hope i covered everything good luck!