Radiator Cooling Fan: Service and Repair
RADIATOR FAN 5.9L DIESELREMOVAL
CAUTION: If the electronically controlled viscous fan drive is replaced because of mechanical damage, the cooling fan blades should also be inspected. Inspect for fatigue cracks, or chipped blades that could have resulted from excessive vibration. Replace fan blade assembly if any of these conditions are found. Also inspect wiring harness and connectors for damage.
1. Disconnect the battery negative cables.
2. Remove coolant recovery container.
3. Using a fastener removal tool, remove the two push pin fasteners from the fan shroud lower half.
4. Unseat the four fastening tabs and remove the lower radiator shroud.
5. Disconnect electrical connector.
6. Remove the electronically controlled viscous fan drive electrical wire from the upper radiator shroud.
7. Using a fastener removal tool, remove the wiring harness bracket from the upper radiator shroud.
CAUTION: Do not remove the fan pulley bolts. This pulley is under spring tension.
8. The electronically controlled viscous fan drive/fan blade assembly is attached (threaded) to the fan pulley shaft (Fig. 4). Remove the fan blade/fan drive assembly from fan pulley by turning the mounting nut counterclockwise (as viewed from front). Threads on the viscous fan drive are RIGHT-HAND. A 36 MM Fan Wrench can be used. Place a bar or screwdriver between the fan pulley bolts to prevent pulley from rotating.
9. Remove the upper radiator shroud mounting bolts.
10. Remove the fan shroud and the fan blade/viscous drive as an assembly from vehicle.
CAUTION: The electronically controlled viscous fan drive is vibration and impact sensitive, especially at the electrical connectors. Do not drop the unit.
11. Remove the six fan blade-to-viscous fan drive mounting bolts.
12. Inspect the fan for cracked, chipped or damaged fan blades.
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.
INSTALLATION
1. Install fan blade assembly to electrically controlled viscous fan drive. Tighten mounting bolts to 24 Nm (18 ft. lbs.) torque.
2. Position the fan blade/viscous fan drive to the vehicle as an assembly.
3. Install the viscous fan drive assembly onto fan pulley hub shaft (Fig. 4). Tighten mounting nut to 115 Nm (85 ft. lbs.) torque.
4. Install upper fan shroud. Make sure the upper shroud locks into the tabs on the lower radiator.
5. Install two upper shroud mounting bolts. Tighten to 11.8 Nm (105 inch lbs.) torque.
6. Position the electronically controlled viscous fan drive wiring into the channel in the upper fan shroud (Fig. 5). Make sure the wiring is not pinched.
7. Install the lower fan shroud into position and verify the two locking tabs have seated.
8. Install two push pin fasteners to lock lower fan shroud to the main assembly.
NOTE: Verify that the fan drive electrical wire does not interfere with fan blade travel when the fan blade is spun by hand.
9. Connect the wiring harness connector and install the harness bracket to the upper radiator shroud.
10. Install the coolant recovery container.
11. Connect the battery negative cables.
NOTE: Viscous Fan Drive Fluid Pump Out Requirement: After installing a new viscous fan drive, bring the engine speed up to approximately 2000 rpm and hold for approximately two minutes. This will ensure proper fluid distribution within the drive.