Ensure the fan/viscous fan drive assembly is still attached to the vehicle when servicing the fan clutch on 3.7L/4.7L/5.7L engines. Look for signs of fatigue cracks, loose blades or loose rivets caused by excess vibration on the cooling fan and console-mount fan if detected, replace the whole assembly. Take a look at the bearing and assembly of the water pump as well, since problems with the viscous fan drive can cause damage. Take off the negative
Battery Cable, but leave the hoses connected to the coolant reserve as you remove the container from the fan shroud. Using Special Tool 6958, counterclockwise motion on the mounting nut will release the
Fan Blade and viscous fan drive from the water pump. Remove all the bolts that connect the shroud to the radiator, extract the lower shroud mounts from the radiator clips and pull the whole fan shroud and fan blade/drive part out at once. Stack the viscous fan drive upright to ensure its silicone fluid will not mix with the lubricant. Make sure not to remove the water pump pulley-to-water pump bolts; the pulley is being held in place by spring tension. Remove the bolts connecting the fan blade assembly to the viscous fan drive, as you might find Reverse marked on some reverse rotating fans and drives on engines with serpentine
Drive Belts and this needs attention because backward installation of these parts can cause the engine to overheat. To install the fan, fasten the fan blade onto the viscous fan drive with bolts that are tightened until you reach 24 Nm (18 ft. lbs.) torque. After that, fit the fan blade and shroud together as a unit and hiscally (Ultra High Temperature, as required) the blown air flow between the shroud and the heatsink. Install the fan blade/viscous fan drive assembly on the water pump shaft using Special Tool 6958. Next, tighten the mounting nut to 50 Nm (37 ft. lbs.). Put the coolant reserve/overflow container back on the fan shroud and attach the negative battery cable. When the new viscous fan drive is installed, turn the engine speed to 2000 rpm and keep it there for two minutes to help the fluid distribute well inside the drive.