Volvo Coupes/Sedans/Wagons 1970-1989 Repair Guide

Heater/Air Conditioner Blower Motor

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REMOVAL & INSTALLATION



1970-72 164 Models
  1. Remove the heater unit as outlined in Heater Unit Removal and Installation.
  2.  
  3. Remove the four rubber bushings on the sides of the heater unit.
  4.  
  5. Scribe marks on both sides of the fan housing to ease reassembly. Remove the spring clips and separate the housing halves.
  6.  
  7. Mark the mounting plate's relative position to the fan housing. Straighten the tabs and separate the mounting plate from the housing.
  8.  
  9. Remove the retaining screws and separate the fan motor from the mounting plate.
  10.  
  11. Reverse the above procedure to install, being careful to apply soft sealer to the housing halves.
  12.  

1800 Series

The fan motor and fan are replaced as a unit.

  1. Remove the valve cover and place a rag over the rocker arm assembly.
  2.  
  3. On 1970-71 models, remove the pressure regulator bracket from the heater and allow it to hang freely.
  4.  
  5. Disconnect the fan motor wires at the fan terminals.
  6.  
  7. Remove the six retaining screws and remove the fan motor from the heater assembly.
  8.  
  9. Reverse the above procedure to install.
  10.  

1973 140 Series and 164 Models
WITHOUT AIR CONDITIONING

See Figures 1 and 2

  1. Remove the heater unit as outlined in Heater Unit Removal and Installation.
  2.  
  3. Place the unit on its side with the control valve facing upward. Remove the spring clips and separate the housing valves.
  4.  
  5. Lift out the old fan motor and replace it with a new unit, making sure that the support leg without the foot points to the output for the defroster channel. (See illustration).
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Use care in separating the case halves



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the heater unit-1973 140 series and 164 series without air conditioning

  1. Assemble the heater housing halves with new spring clips, and seal the joint without clips using soft sealing compound.
  2.  

  1. Install the heater unit as outlined in Heater Unit Removal and Installation.
  2.  

WITH AIR CONDITIONING

See Figure 3

In order to remove the blower motor, both the right and left turbines (blower wheels) must first be removed. The heater unit does not have to be removed.

  1. Disconnect the negative battery cable.
  2.  
  3. Lift the carpet and remove the central unit side panels.
  4.  
  5. Remove the retaining screws for the control panel and move the panel as far back on the transmission tunnel as the electrical cables will permit.
  6.  
  7. Remove the attaching screws for the rear seat heater ducts and disconnect the ducts from the central unit.
  8.  
  9. Remove the instrument cluster as outlined in Instrument Cluster Removal and Installation.
  10.  
  11. Remove the glovebox by unscrewing the four attaching screws, removing the glovebox door stop, and disconnecting the wires from the glovebox courtesy light. Remove the molded dashboard padding from beneath the glovebox.
  12.  
  13. Disconnect the vacuum hoses to the left and right defroster vacuum motors, then remove the nozzles and both air ducts.
  14.  
  15. Remove the air hoses between the left and right inside air vents.
  16.  
  17. Remove the clamps on the central unit outer ends and remove the ends.
  18.  
  19. Pry off the locking retainer from the turbines (blower wheels), and remove both left and right turbines.
  20.  
  21. Position the heater control valve capillary tube to one side.
  22.  
  23. Remove the left inner end (blower housing) from the central unit.
  24.  
  25. Unscrew the three retaining screws and remove the fan motor retainer.
  26.  
  27. Disconnect the plug from the fan motor control panel. Release the tabs of the electric cables from the plug contact, remove the rubber grommet, and pull the electric cables down through right side opening of the central unit.
  28.  
  29. Remove the fan motor from the left opening.
  30.  



Click image to see an enlarged view

Fig. Fig. 3: Details of the heater/air conditioning unit-1973 140 series and 164 with A/C, as well as all 1974 and later models except the 700 series

To install:
  1. When reinstalling, pass the cable through the opening, connect it and replace the rubber grommet.
  2.  
  3. Mount and secure the fan motor. Remember to install the plastic bushings on the fan mounts; failure to do so will make the fan rub the case.
  4.  
  5. Reinstall the inner casing (housing) and hook up the capillary tube.
  6.  
  7. Reinstall the blower wheels and secure the locking clip. Install the outer ends of the central unit and attach their clips.
  8.  
  9. Connect the ductwork to the inside air vents. Reinstall the defroster nozzles and connect the vacuum hoses to the vacuum motors.
  10.  
  11. Replace the molded insulation and reassemble the glovebox.
  12.  
  13. Reinstall the instrument cluster.
  14.  
  15. Connect and secure the rear seat heating ducts. Slide the control panel back towards the dash and into position.
  16.  
  17. Install the central unit side panels. Reconnect the negative battery cable.
  18.  

1974 and Later Models Except 700 Series

See Figures 3, 4, 5, 6, 7, 8, 9, 10 and 11

In order to remove the blower motor, both the right and left turbines (blower wheels) must first be removed. The heater unit does not have to be removed.

  1. Disconnect the negative battery cable.
  2.  
  3. Lift the carpet and remove the central unit side panels.
  4.  
  5. Remove the retaining screws for the control panel and move the panel as far back on the transmission tunnel as the electrical cables will permit.
  6.  
  7. Remove the attaching screws for the rear seat heater ducts and disconnect the ducts from the central unit.
  8.  
  9. Remove the instrument cluster as outlined in Instrument Cluster Removal and Installation.
  10.  
  11. Remove the glovebox by unscrewing the four attaching screws, removing the glovebox door stop, and disconnecting the wires from the glovebox courtesy light. Remove the molded dashboard padding from beneath the glovebox.
  12.  



Click image to see an enlarged view

Fig. Fig. 4: Unscrew the glovebox-be sure to have an undisturbed location to save hardware for reinstallation



Click image to see an enlarged view

Fig. Fig. 5: Pull out the glovebox, disconnect the courtesy light, then remove the glovebox

  1. Disconnect the vacuum hoses to the left and right defroster vacuum motors, then remove the nozzles and both air ducts.
  2.  



Click image to see an enlarged view

Fig. Fig. 6: Remove the nozzles and both air ducts

  1. Remove the air hoses between the left and right inside air vents.
  2.  
  3. Remove the clamps on the central unit outer ends and remove the ends.
  4.  



Click image to see an enlarged view

Fig. Fig. 7: Remove any screws used to secure the turbine case halves together

  1. Pry off the locking retainer from the turbines (blower wheels), and remove both left and right turbines.
  2.  



Click image to see an enlarged view

Fig. Fig. 8: Use a small prytool to remove the clips that hold the case halves together

  1. Position the heater control valve capillary tube to one side.
  2.  



Click image to see an enlarged view

Fig. Fig. 9: Maneuver the case half past any wires and set it aside

  1. Remove the left inner end (blower housing) from the central unit.
  2.  



Click image to see an enlarged view

Fig. Fig. 10: Remove the fastener that holds the turbine to its shaft



Click image to see an enlarged view

Fig. Fig. 11: Remove the turbine to allow removal of the electric motor

  1. Unscrew the three retaining screws and remove the fan motor retainer.
  2.  
  3. Disconnect the plug from the fan motor control panel. Release the tabs of the electric cables from the plug contact, remove the rubber grommet, and pull the electric cables down through right side opening of the central unit.
  4.  
  5. Remove the fan motor from the left opening.
  6.  

To install:
  1. When reinstalling, pass the cable through the opening, connect it and replace the rubber grommet.
  2.  
  3. Mount and secure the fan motor. Remember to install the plastic bushings on the fan mounts; failure to do so will make the fan rub the case.
  4.  
  5. Reinstall the inner casing (housing) and hook up the capillary tube.
  6.  
  7. Reinstall the blower wheels and secure the locking clip. Install the outer ends of the central unit and attach their clips.
  8.  
  9. Connect the ductwork to the inside air vents. Reinstall the defroster nozzles and connect the vacuum hoses to the vacuum motors.
  10.  
  11. Replace the molded insulation and reassemble the glovebox.
  12.  
  13. Reinstall the instrument cluster.
  14.  
  15. Connect and secure the rear seat heating ducts. Slide the control panel back towards the dash and into position.
  16.  
  17. Install the central unit side panels. Reconnect the negative battery cable.
  18.  

740, 760 and 780 Models

See Figures 12, 13 and 14

The 700 series of Volvos may be found equipped with any of three heating and air conditioning systems. The combined unit (CU) is simply a manually operated heater, with or without an air conditioner system. The Automatic Climate Control (ACC) system maintains a constant (preset) temperature in the car by mechanical (vacuum) means, turning on the heater or A/C as necessary. The newer Electronic Climate Control (ECC) system performs the same duties electronically and incorporates an internal self-diagnostic system which will display a signal when it detects a fault. To remove the blower motor:



Click image to see an enlarged view

Fig. Fig. 12: Remove the indicated panels to access the CU system

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the panel below the glove compartment. Depending on the model, it may be necessary to remove the glove box.
  4.  



Click image to see an enlarged view

Fig. Fig. 13: Exploded view of the blower assembly-ECC system

  1. On cars with the CU system, remove the right sill plate and the right kick panel. Carefully disconnect the control unit connector, remove the mounting screws and remove the control unit with its bracket.
  2.  
  3. Disconnect the wiring to the fan motor, unfasten the screws securing the fan motor, and lower the motor.
  4.  



Click image to see an enlarged view

Fig. Fig. 14: Exploded view of the CU heater system

  1. Remove the motor and fan.
  2.  

To install:
  1. Reconnect the wiring to the fan motor. Spread a sealer around the mounting face of the fan mounting flange, and install the fan motor. Cars with ECC have a rubber seal between the motor and the fan case; no sealer is required.
  2.  
  3. Reconnect the breather hose to the motor and connect the negative battery cable. Check the fan operation.
  4.  
  5. Reinstall the control unit and secure its connector on cars with the CU system. Replace the right kick panel and the sill plate.
  6.  
  7. Reinstall the panel below the glove compartment and the glove box if removed.
  8.  

 
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