Radiator Cooling Fan: Service and Repair

VISCOUS DRIVE FAN

REMOVAL
1. Partially drain the cooling system
2. Remove the upper radiator hose.
3. Remove the air filter housing assembly





4. Using Tool 6958 and adapter pins 8346 (1), remove fan/viscous fan drive assembly from water pump. Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.
5. Position the fan and drive assembly in the radiator shroud.
6. Remove the two shroud mounting screws.
7. Remove the radiator shroud and fan drive assembly.
8. After removing fan blade/viscous fan drive assembly, do not place viscous fan drive in horizontal position. If stored horizontally, silicone fluid in the viscous fan drive could drain into its bearing assembly and contaminate lubricant.
9. Remove four bolts securing fan blade assembly to viscous fan drive.

CLEANING
Clean the fan blades using a mild soap and water. Do not use an abrasive to clean the blades.

INSPECTION

WARNING: DO NOT ATTEMPT TO BEND OR STRAIGHTEN FAN BLADES IF FAN IS NOT WITHIN SPECIFICATIONS.

CAUTION: If fan blade assembly is replaced because of mechanical damage, water pump and viscous fan drive should also be inspected. These components could have been damaged due to excessive vibration.

1. Remove fan blade assembly from viscous fan drive unit (four bolts).
2. Lay fan on a flat surface with leading edge facing down. With tip of blade touching flat surface, replace fan if clearance between opposite blade and surface is greater than 2.0 mm (0.090 in.). Rocking motion of opposite blades should not exceed 2.0 mm (0.090 in.). Test all blades in this manner.
3. Inspect fan assembly for cracks, bends, loose rivets or broken welds. Replace fan if any damage is found.

INSTALLATION
1. Install fan blade assembly to viscous fan drive. Tighten bolts to 23 Nm (17 ft. lbs.) torque.
2. Position fan blade/viscous fan drive assembly into the radiator shroud.
3. Install the radiator shroud and fan drive assemble into the vehicle.
4. Install fan shroud retaining screws. Tighten screws to 6 Nm (50 in. lbs.)
5. Install fan blade/viscous fan drive assembly to water pump shaft.
6. Install the upper radiator hose.
7. Fill cooling system.
8. Connect battery negative cable.