BMW Cars 1999-06

Mechanical (Belt Driven) Fan

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Removal & Installation



The engine cooling fan may be one of two types, either electrically operated, or mounted onto the water pump spindle and driven by the engine's accessory drive belt. On engines equipped with a belt driven cooling fan, the fan must be removed before the radiator can be removed. If the cooling fan is to removed to perform a repair procedure that does not call for radiator removal, the radiator can be protected by sliding a thin piece of sheet metal or sturdy cardboard onto the radiator in place of the cooling fan and shroud.

  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Remove the radiator trim cover fasteners. The fasteners may be a combination of two types, self-tapping screws and a two piece button styled rivet which are removed by using a trim panel tool to first extract the locking pin, and then removing the rivet.
  4.  
  5. With the fasteners removed, lift the trim cover off.
  6.  
  7. On 6-cylinder models:
    1. Remove the alternator cooling hose.
    2.  
    3. If installed, remove the rubber gaiter near the washer solvent reservoir.
    4.  

  8.  
  9. On 4-cylinder models, locate the fresh air duct locking clip tucked behind the right headlight assembly and release the clip by pulling upward. Then remove the engine fresh air intake duct by sliding the duct outward and up
  10.  
  11. On models equipped with a water pump mounted, belt driven cooling fan:
    1. Support the water pump pulley using Tool No. 11 5 030 or by using a suitable sized, thin gooseneck pliers.
    2.  
    3. Using Tool No. 11 5 040 or a 32mm (1 1 / 4 inch) open end wrench loosen the fan coupling nut by turning it clockwise .
    4.  

  12.  


NOTE
The fan clutch water pump coupling is a left hand thread.

  1. Remove the lock pins from the upper fan shroud rivets on the upper corners of the fan shroud and carefully press the center of the fan cowl backwards to release the guide clip.
  2.  
  3. Carefully lift both the fan shroud and fan assembly together, upward and away from the radiator.
  4.  
  5. Matchmark the cooling fan to the fan coupling and remove the fan from the coupling by removing the three fasteners.
  6.  

  1. On models equipped with electric engine cooling fans:
    1. Detach the fan electrical connector.
    2.  
    3. Remove the fasteners at the upper corners of the fan shroud.
    4.  
    5. Lift the fan shroud along with the cooling fan up and out of the engine compartment.
    6.  
    7. Remove the cooling fan from the electric motor.
    8.  

  2.  



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Fig. Remove the top trim cover to gain access to the intake fresh air duct



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Fig. With the fasteners removed, lift the trim cover off



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Fig. The fresh air duct locking clip is tucked behind the right headlight assembly



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Fig. Remove the engine fresh air intake duct by lifting the lock tab and sliding the duct outward and up



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Fig. Cooling fan removal tools



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Fig. On models equipped with electric engine cooling fans, disconnect the fan's electrical connector, then . . .



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Fig. . . . remove the fasteners at the upper corners of the fan shroud and . . .



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Fig. . . . lift the cooling fan up and out of the engine compartment

To install:

  1. Before installing the fan, check the condition of the drive belts and coolant hoses. Replace if brittle, damaged or worn.
  2.  
  3. On models with electric cooling fans:
    1. When installing the fan shroud, make sure the shroud seats correctly at the bottom corners.
    2.  
    3. Make sure all electrical connections are properly installed.
    4.  
    5. Upon installation, verify proper operation of the cooling fan.
    6.  

  4.  
  5. On models with a water pump mounted cooling fan:
    1. Inspect the condition of the fan clutch and replace if excessively loose or damaged.
    2.  
    3. Make sure the cooling fan is properly attached to the fan clutch.
    4.  
    5. Place both the cooling fan and shroud into the engine compartment together, making sure the shroud seats in its lower retainers securely.
    6.  
    7. Install the upper fan shroud rivets to secure the fan shroud.
    8.  
    9. Install the fan and fan clutch assembly onto the water pump spindle, rotating the fan clutch spindle nut counterclockwise to install.
    10.  

  6.  


NOTE
The water pump spindle threads for the cooling fan and fan clutch assembly are left hand threads, therefore the fan clutch assembly must be rotated counterclockwise to install. As there is a minimum amount of clearance between the water pump and the radiator, turning the spindle nut for the fan clutch assembly when installing it onto the water pump spindle may be difficult.

  1. To assist with the installation of the fan clutch assembly, use a piece of thin, sturdy string about 3 feet (1 meter) long. Wind the string around the fan clutch mounting nut in a clockwise direction 15-20 revolutions, leaving about 6 inches (150mm) of string unwound. Position the fan clutch nut onto the water pump spindle squarely, and while holding the fan, slowly pull the string to spin the fan clutch nut in a counterclockwise direction. Once the nut begins to thread onto the water pump spindle, remove the remainder of the string.
  2.  
  3. Support the water pump pulley using Tool No. 11 5 030 or by using a suitable sized, thin gooseneck pliers.
  4.  
  5. Tighten the fan clutch nut counterclockwise as follows:

    Using tool No. 11-5-040: 22 ft. lbs. (30 Nm)
     
    Without tool No. 11-5-040: 29 ft. lbs. (40 Nm)
     

  6.  

  1. The balance of the installation is in reverse order of assembly, making sure to verify proper operation of the cooling fan.
  2.  

 
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