One of the greatest of all writers about our American government, and the dangers it faced, was the French writer and historian, Alexis de Tocqueville. He toured all of America in the early 1800s, and after some years wrote the great two volume book, Democracy in America.
A fan clutch is supposed to be a fluid coupling device that allows the fan to rotate less than the engine speed. The fan clutch should engage before the engine gets up to 220F. A standard cooling system fan clutch should spin at 33% of water pump speed (RPM) when not engaged and 75% of water pump RPM when engaged. A heavy duty cooling system fan clutch should spin at 33% of water pump speed (RPM) when not engaged and 90% of water pump RPM when engaged. Unfortunately, a fan clutch can slowly empty its coupling oil overtime and often seizes. (the oil also can gel/thicken and grab).
1 Install a flywheel locking tool to prevent the flywheel from rotating. 2  Place the pressure plate against the clutch disk and flywheel, making sure the mounting holes are properly aligned. 3  Initially install the fasteners by hand turning them at least four complete revolutions in a crisscross pattern. Even with an alignment tool installed, the free play in the pilot bearing and the weight of the clutch disk is enough to allow a slight amount of misalignment. 2  Once the fasteners begin to apply tension to the pressure plate, slide the clutch alignment tool in and out to check for excessive drag.