Ram B1500, B2500, B3500, 1999-2003

Mechanical (Belt Driven) Fan

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The fan is threaded onto the water pump shaft with a 36mm nut. To loosen the nut, the pump must be prevented from turning. This can be accomplished with a special tool or with a prybar.

Fan and fan shroud are removed together.

Removal & Installation




WARNING
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.  
  3. Remove fan shroud-to-engine bracket nuts.

    Click image to see an enlarged view

    Fig. View of the fan wiring bracket (1), bracket mounting bolts (2), shroud mounting bracket (3), viscous fan connector (4)-5.9L diesel engine

  4.  
  5. Detach the electronically controlled viscous fan electrical connector from the lower fan shroud bracket.
  6.  
  7. Remove wiring bracket -to-lower fan shroud bracket mounting bolt.
  8.  
  9. Remove fan drive wire harness support from fan shroud.
    CAUTION
    Do not remove the fan pulley bolts. This pulley is under spring tension.

  10.  
  11. The electronically controlled viscous fan drive/fan blade assembly is attached (threaded) to the fan pulley shaft. 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 36mm Fan Wrench can be used. Place a bar or screwdriver between the fan pulley bolts to prevent pulley from rotating.
    NOTE
    It may be necessary to loosen the top two fan shroud brackets. Removal of the engine mounted fan shroud brackets is not necessary unless removing or installing the engine.

  12.  
  13. Collapse fan shroud toward front of vehicle and remove fan drive/fan blade and fan shroud as an assembly.
    WARNING
    The electronically controlled viscous fan drive is vibration and impact sensitive, especially at the electrical connectors. Do not drop the unit.



    Click image to see an enlarged view

    Fig. Exploded view of the electrical connector (1), viscous fan drive (2), fan blade (3), bolts (4) and radiator fan pulley (5)-5.9L diesel engines

  14.  
  15. Remove the six fan blade-to-viscous fan drive mounting bolts.
  16.  
  17. Inspect the fan for cracked, chipped or damaged fan blades.
  18.  

To install:


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.

  1. Install fan blade assembly to electrically controlled viscous fan drive. Tighten mounting bolts to 18 ft. lbs. (24 Nm).
  2.  
  3. Loosen both upper engine mounted fan shroud brackets.
  4.  
  5. Make sure lower engine mounted fan shroud bracket bolts are tightened to 18 ft. lbs. (24 Nm).
  6.  
  7. Position fan/fan drive assembly inside fan shroud and lower into position.
  8.  
  9. Install the viscous fan drive assembly onto fan pulley hub shaft . Tighten mounting nut to 85 ft. lbs. (115 Nm).
  10.  
  11. Install fan drive wire harness support to fan shroud.
  12.  
  13. Install viscous fan wiring bracket onto lower fan shroud bracket. Tighten nut to 18 ft. lbs. (24 Nm).
  14.  
  15. Install fan shroud onto fan shroud brackets.
  16.  
  17. Connect fan drive wire harness.
  18.  
  19. Install fan shroud to upper engine fan shroud brackets. Tighten nut finger-tight.
  20.  
  21. Tighten upper engine fan shroud bracket bolts to 18 ft. lbs. (24 Nm).
  22.  
  23. Tighten four fan shroud bracket nuts to 18 ft. lbs. (24 Nm).
  24.  
  25. Make sure of fan tip clearance all the way around inside of fan shroud.
  26.  
  27. Connect the battery negative cables.
  28.  


NOTE
Fan belt removal is not necessary to remove cooling system fan.

  1. Disconnect the negative battery cable at battery.
  2.  
  3. Remove the plastic air cleaner intake tube.
  4.  
  5. Remove two-piece fan shroud. Remove the lower half first.
  6.  
  7. The thermal viscous fan drive/fan blade assembly is attached (threaded) to the water pump hub shaft. Remove the fan blade/fan drive assembly from water pump by turning the mounting nut counterclockwise (as viewed from front). Threads on the viscous fan drive are RIGHT HAND. A Snap-On® 36mm Fan Wrench (number SP346 from Snap-On® Cummins Diesel Tool Set number 2017DSP) can be used with Special Tool 6958 Spanner Wrench and Adapter Pins 8346 to prevent the pulley from rotating. Do not unbolt fan blade assembly from the viscous fan drive at this time.
    WARNING
    After removing fan blade/fan drive assembly do not place the thermal viscous fan drive in the horizontal position. If stored horizontally, the silicone fluid in the viscous fan drive could drain into its bearing assembly and contaminate the bearing lubricant.



    Click image to see an enlarged view

    Fig. Using Special Tool 6958 Spanner Wrench and Adapter Pins 8346

  8.  
  9. Remove the four bolts securing the fan blade assembly to the viscous fan drive.

    Click image to see an enlarged view

    Fig. Exploded view of the water pump bypass hose (1), fan blade assembly (2), viscous fan drive (3), and water pump and pulley (4)

  10.  

To install:

  1. Install fan blade assembly to viscous fan drive. Tighten the bolts to 17 ft. lbs. (23 Nm).
  2.  
  3. Install the fan blade/viscous fan drive assembly to water pump shaft.
  4.  
  5. Install fan shroud.
  6.  
  7. Install air cleaner intake tube.
  8.  
  9. Connect negative battery cable.
  10.  


NOTE
Gasoline engine fans have a standard RIGHT-HAND thread. Turn CCW to loosen. Diesel engine fans have a LEFT-HAND thread. Turn CW to loosen.

  1. Disconnect the battery negative cable(s).
  2.  
  3. Disconnect the throttle cable is attached to the fan shroud.
  4.  
  5. Remove the windshield washer bottle and coolant overflow tank from the fan shroud.
  6.  
  7. Stop the water pump from turning with a special tool or prybar on the nuts. Loosen the fan nut (36mm). Turn CCW to loosen on gasoline engines; turn CW to loosen on diesel engines.
  8.  
  9. Remove the fan shroud mounting hardware. These may be bolts, clips or a combination of the two, depending on model.
  10.  
  11. Remove the fan and shroud together.
  12.  


WARNING
Store the fan in the vertical (operating) position. If placed on its side, the silicone fluid in the viscous drive could drain into the bearing assembly and contaminate the lubricant.

  1. To replace the fan or viscous drive, remove the four bolts and separate the components.
  2.  

To install:

  1. If drive and fan were separated, tighten the bolts to 17 ft. lbs. (23 Nm).
  2.  
  3. The remainder of the installation procedure is the reverse of removal. The recommended fan nut torque (on diesel engines) is 42 ft. lbs. (57 Nm).
  4.  
  5. If a new viscous drive has been fitted, start and run the engine at 2,000 rpm for about two minutes to distribute fluid within the drive.
  6.  



Click image to see an enlarged view

Fig. Typical engine fan assembly



Click image to see an enlarged view

Fig. Remove the windshield washer bottle from the fan shroud



Click image to see an enlarged view

Fig. Loosening the fan nut



Click image to see an enlarged view

Fig. To loosen the fan nut, stop the pump shaft from turning. This tool will do it; you could also use a prybar. In this photo, the fan has been removed for clarity



Click image to see an enlarged view

Fig. Removing fan and shroud together

3.7L, 4.7L & 5.7L Engines

NOTE
Do NOT attempt to remove the fan/viscous fan drive assembly from the vehicle at this time.


WARNING
If the viscous fan drive is replaced because of mechanical damage, the cooling fan blades should also be inspected. Inspect for fatigue cracks, loose blades, or loose rivets that could have resulted from excessive vibration. Replace fan blade assembly if any of these conditions are found. Also inspect water pump bearing and shaft assembly for any related damage due to a viscous fan drive malfunction.

  1. Disconnect negative battery cable from battery.
  2.  
  3. Remove coolant reserve/overflow container from fan shroud and lay aside. Do not disconnect the hoses or drain coolant from the container.
    NOTE
    The thermal viscous fan drive/fan blade assembly is attached (threaded) to the water pump hub shaft.

  4.  
  5. Remove the fan blade/viscous fan drive assembly from the water pump by turning the mounting nut counterclockwise as viewed from the front. Threads on the viscous fan drive are RIGHT-HAND. A 36mm Fan Wrench (Special Tool 6958 Spanner Wrench, or equivalent) should be used to prevent pulley from rotating.
    NOTE
    Do NOT unbolt the fan blade assembly from viscous fan drive at this time.



    Click image to see an enlarged view

    Fig. View of the special tool spanner wrench with the adapter pins (1) and the engine fan (2)

  6.  
  7. Remove the fan shroud-to-radiator mounting bolts.
  8.  
  9. Pull the lower shroud mounts out of the radiator tank clips.
  10.  
  11. Remove the fan shroud and fan blade/viscous fan drive assembly as a complete unit from vehicle.
    NOTE
    After removing the fan blade/viscous fan drive assembly, do not place the viscous fan drive in a horizontal position. If stored horizontally, silicone fluid in the viscous fan drive could drain into its bearing assembly and contaminate lubricant.


    CAUTION
    Do not remove water pump pulley-to-water pump bolts. This pulley is under spring tension.

  12.  
  13. Remove four bolts securing fan blade assembly to viscous fan drive.
    WARNING
    Some engines equipped with serpentine drive belts have reverse rotating fans and viscous fan drives. They are marked with the word REVERSE to designate their usage. Installation of the wrong fan or viscous fan drive can result in engine overheating

  14.  

To install:


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.

  1. Install fan blade assembly to the viscous fan drive. Tighten the bolts to 18 ft. lbs. (24 Nm).
  2.  
  3. Position the fan shroud and the fan blade/viscous fan drive assembly to the vehicle as a complete unit.
  4.  
  5. Install the fan shroud.
  6.  
  7. Install the fan blade/viscous fan drive assembly to the water pump shaft. Tighten mounting nut to 37 ft. lbs. (50 Nm).
  8.  
  9. Install the coolant reserve/overflow container to the fan shroud.
  10.  
  11. Connect the negative battery cable.
  12.  

3.9L, 5.2L, 5.9L And 8.0L Engines

WARNING
If the viscous fan drive is replaced because of mechanical damage, the cooling fan blades should also be inspected. Inspect for fatigue cracks, loose blades, or loose rivets that could have resulted from excessive vibration. Replace fan blade assembly if any of these conditions are found. Also inspect water pump bearing and shaft assembly for any related damage due to a viscous fan drive malfunction.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove throttle cable at top of fan shroud.
  4.  
  5. For all engines except the 8.0L, unsnap coolant reserve/overflow tank from fan shroud and lay aside. The tank is held to shroud with T- shaped slots. Do not disconnect hose or drain coolant from tank.
  6.  
  7. The thermal viscous fan drive/fan blade assembly is attached (threaded) to water pump hub shaft. Remove fan blade/viscous fan drive assembly from water pump by turning mounting nut counterclockwise as viewed from front. Threads on viscous fan drive are RIGHT-HAND. A Snap-On® 36mm Fan Wrench (number SP346 from Snap-On® Cummins Diesel Tool Set number 2017DSP), Special Tool 6958 Spanner Wrench and Adapter Pins 8346 should be used to prevent pulley from rotating.

    Click image to see an enlarged view

    Fig. Exploded view of the water pump bypass hose (1), fan blade assembly (2), viscous fan drive (3) and water pump and pulley (4)-Typical



    Click image to see an enlarged view

    Fig. Using the special tool (1) to prevent the pulley from turning when removing the fan (2)

  8.  
  9. Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.
  10.  
  11. Do not unbolt fan blade assembly from viscous fan drive at this time.
  12.  
  13. Remove four fan shroud-to-radiator mounting bolts.
  14.  
  15. Remove fan shroud and fan blade/viscous fan drive assembly as a complete unit from vehicle.
  16.  
  17. 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.
    WARNING
    Do not remove the water pump pulley-to-water pump bolts. This pulley is under spring tension. Remove four bolts securing fan blade assembly to viscous fan drive.


    WARNING
    Some engines equipped with serpentine drive belts have reverse rotating fans and viscous fan drives. They are marked with the word REVERSE to designate their usage. Installation of the wrong fan or viscous fan drive can result in engine overheating.

  18.  

To install:

  1. Install fan blade assembly to viscous fan drive. Tighten the bolts to 17 ft. lbs. (23 Nm).
  2.  
  3. Position fan shroud and fan blade/viscous fan drive assembly to vehicle as a complete unit.
  4.  
  5. Install fan shroud.
  6.  
  7. Install fan blade/viscous fan drive assembly to water pump shaft.
  8.  
  9. On all engines except the 8.0L, install the coolant reserve/overflow tank to fan shroud. It snaps into position.
  10.  
  11. Install throttle cable to fan shroud.
  12.  
  13. Connect the negative battery cable.
    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.

  14.  

 
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