BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Heater Blower Motor

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REMOVAL & INSTALLATION



E30 3 Series

The blower is accessible by removing the cover at the top of the firewall in the engine compartment.

  1. Disconnect the negative battery cable. To remove the motor cover, pull off the rubber weatherstrip, cut off wire ties holding the wire that runs diagonally across the cover, unscrew and remove the bolts, and pull the cover aside.
  2.  
  3. Release the retaining straps, move them to the side, and then remove the blower cover.
  4.  
  5. Pull off both electrical connectors. Disengage the clamp that fastens the assembly in place by pulling the bottom. Lift out the motor/fan assembly, being careful not to damage the flap underneath.
  6.  

To install:
  1. The fan and motor assembly is balanced at the factory. Do not disturb the orientation of the fan and motor during installation. Place the fan and motor into the heater and install the clamp.
  2.  
  3. Connect the wires and install the fan cover. Attach the straps.
  4.  
  5. Install the outside cover and install the 4 bolts. Install new wire ties on the diagonal wire and replace the weather-stripping. Connect the negative battery cable.
  6.  

E36 3 Series

See Figures 1 through 4



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Fig. Fig. 1: Remove the electrical duct screws from inside the air intake cowl-E36 3 Series



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Fig. Fig. 2: Release the clips to remove the blower cover-E36 3 Series



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Fig. Fig. 3: Release the clips from the left flap upper section to gain access to the blower-E36 3 Series



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Fig. Fig. 4: Match the color dots and indents with the shaft when installing the fans on the motor shaft-E36 3 Series

  1. Turn the ignition switch to the OFF position. Remove the air intake cowl weather-stripping. Remove the grill by gently prying out.
  2.  
  3. Remove the 2 screws inside the air intake cowl holding the electrical duct.
  4.  
  5. Remove the 2 screws holding the right side of the air intake cowl and remove the screw holding the left side. Pull the cowl out from above. It may be very hard to remove, but it will come out.
  6.  
  7. On M50 equipped vehicles, remove the injector cover plate and the valve cover cladding from the engine.
  8.  
  9. On M50 equipped vehicles, remove the cover from the control unit housing on the right side of the firewall and disconnect the control units plugs. Remove the screws from the injector plug plate and place the plate off to the side. Disconnect the control cable inside the housing.
  10.  
  11. Unclip the heater blower cover. Disconnect the wiring from the motor.
  12.  
  13. Undo the left flap upper section clips and remove. Disconnect the blower from the brace and remove.
  14.  

To install:
  1. If the blower fans are removed, install them so the drive pins fit into the correct indents and the color dots match.
  2.  
  3. Install the fan into the brace and connect the wires. Clip the blower cover into place.
  4.  
  5. On M50 equipped vehicles, connect the control cable, install the injector plug plate, connect the control unit plugs and install the control unit housing cover. Install the valve cover cladding and the injector cover.
  6.  
  7. Install the air intake cowl and screws. Replace the electrical duct screws and the intake grill. Install the weather-stripping.
  8.  

E34 5 Series
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rubber insulator from the cowl. Remove the mounting bolts and the radiator expansion tank located under the windshield on vehicles equipped. Remove the intensive washing fluid reservoir, if necessary.
  4.  
  5. Remove the wire ties holding the cable to the cover. Remove the screws holding the housing cover and remove the cover. Remove the cable and release the clips to remove the blower cover.
  6.  
  7. Disconnect the electrical connector for the motor. Unclip the retaining strap for the motor and remove the motor and blower wheels.
  8.  

To install:
  1. Replace the motor and blower wheels as an assembly (prebalanced). The motor will fit into the housing only one way. The flat surface on the inlet cowls face the body.
  2.  
  3. Install the blower cover and clip into place. Install the housing cover and replace the screws. Replace the cable wire ties.
  4.  
  5. Install the intensive washing fluid reservoir or the expansion tank, as equipped. Install the weather-stripping.
  6.  

 
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