Radiator Cooling Fan: Service and Repair
RADIATOR FAN 4.7LREMOVAL
1. Raise vehicle on hoist.
2. Drain cooling system.
NOTE: The hydraulic fan drive is driven by the power steering pump. When removing lines or hoses from fan drive assembly use a drain pan to catch any power steering fluid that may exit the fan drive or the lines and hoses.
NOTE: Whenever the high pressure line fittings are removed from the hydraulic fan drive the O-rings must be replaced.
3. Disconnect two high pressure lines at hydraulic fan drive. Remove and discard 0-rings from line fittings.
4. Disconnect low pressure return hose at hydraulic fan drive.
NOTE: The lower mounting bolts can only be accessed from under vehicle.
5. Remove two lower mounting bolts from the shroud.
6. Lower vehicle.
7. Disconnect the electrical connector for the fan control solenoid.
8. Disconnect the radiator upper hose at the radiator and position out of the way.
9. Disconnect the power steering gear outlet hose and fluid return hose at the cooler.
10. Remove two upper mounting bolts from the shroud.
11. Remove the shroud and fan drive from vehicle.
CLEANING
Clean the fan blades using a mild soap and water. Do not use an abrasive to clean the blades.
INSTALLATION
CAUTION: There is an external ground wire connected to the hydraulic fan drive located at the electrical connector on the fan assembly. This ground MUST remain connected at all times. Failure to ensure ground wire is connected when engine is operating can cause severe damage to the JTEC module.
1. Position fan drive and shroud in vehicle.
2. Install fan shroud upper mounting bolts. Do not tighten at this time.
3. Install radiator upper hose onto radiator.
4. Connect power steering cooler hoses.
5. Raise vehicle on hoist.
6. Install fan shroud lower mounting bolts. Tighten to 6 Nm (50 in. lbs.).
NOTE: Whenever the high pressure line fittings are removed from the hydraulic fan drive the 0-rings located on the fittings must be replaced.
7. Lubricate the 0-rings on the fittings with power steering fluid then connect inlet and outlet high pressure lines to fan driv. Tighten inlet line to 49 Nm (36 ft. lbs.) tighten outlet line to 29 Nm (21.5 ft. lbs.).
8. Connect low pressure return hose to fan drive.
9. Lower vehicle.
10. Install radiator upper hose.
11. Connect electrical connector for hydraulic fan control solenoid.
12. Tighten fan shroud upper mounting bolts to 6 Nm (50 in. lbs.).
13. Refill cooling system.
CAUTION: Do not run engine with power steering fluid below the full mark in the reservoir. Sever damage to the hydraulic cooling fan or the engine can occur.
14. Refill power steering fluid reservoir and bleed air from steering system.
15. Run engine and check for leaks.