ParkAvenue 1997-1999

Electric Engine Fan

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Electric Fan Switch



Operation

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

When the switch reaches a predetermined temperature, it closes the circuit to the relay. This energizes the relay, sending 12 volts to the fan. When the temperature decreases below the set point of the sender, the circuit opens and the voltage is no longer applied to the fan.

Removal & Installation

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the switch electrical lead and remove the switch.
  4.  



Click image to see an enlarged view

Fig. Typical electric fan motor and resistor locations

To install:

  1. Install the switch and connect the electrical lead.
  2.  
  3. Connect the battery cable.
  4.  

Testing

Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Connect a jumper wire from the negative battery terminal to the black wire, or its terminal, on the electric fan motor.
  2.  
  3. Connect a jumper wire from the battery positive terminal to the remaining wire or terminal on the motor.
  4.  
  5. The fan should operate. If the fan does not operate, the motor may be defective and it should be replaced.
  6.  

Removal & Installation



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Disconnect the negative battery cable.
  2.  


CAUTION
Always keep yours hands, clothing and tools away from the fan assembly. The electric cooling fan can start even when the engine is not running, causing personal injury.



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Fig. Be very careful when working around the fans, as they can start running even if the engine is off!

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the retainers, then remove the splash shield.
  4.  



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Fig. Remove the retaining bolts/screws, then remove the splash shield

  1. Detach the fan wiring harness from the motor and fan frame.
  2.  



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Fig. Remove the fan electrical connector retaining clip ...



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Fig. ... then unplug the fan electrical connector

  1. Remove lower fan mounting bolts.
  2.  



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Fig. Unfasten the lower fan mounting bolts. On this vehicle, there are three bolts (see arrows)

  1. Carefully lower the vehicle.
  2.  
  3. If necessary, remove the fan guard and the hose support.
  4.  
  5. Unfasten the retaining bolts, then remove the fan assembly from the radiator support.
  6.  



Click image to see an enlarged view

Fig. Remove the 4 fan-to-radiator upper panel mounting bolts



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Fig. Remove the left and ...



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Fig. ... right side fan assemblies from the vehicle



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Fig. Detach the fan connector and unfasten the retaining bolts



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Fig. Exploded view of the electric cooling fan mounting

  1. If necessary to disassemble the fan, remove the retainer(s), then separate the fan blade from the electric fan motor.
  2.  



Click image to see an enlarged view

Fig. If necessary, the electric cooling fan can be disassembled after removal


CAUTION
In order to prevent personal injury or damage to the vehicle, you should always replace a bent, cracked or damaged fan blade or housing.

To install:

  1. If removed, install the fan blade to the electric fan motor and secure with the retainer(s).
  2.  
  3. Install the fan assembly to the radiator support. Tighten the retaining bolts to 89 inch lbs. (10 Nm).
  4.  
  5. If removed, install the fan guard and the hose support.
  6.  
  7. Attach the fan wiring harness to the motor and fan frame.
  8.  
  9. Connect the negative battery cable.
  10.  

Testing



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. If the fan doesn't operate, disconnect the fan and apply voltage across the fan terminals. If the fan still doesn't run, it needs a new motor.
  2.  
  3. If the fan runs, with the jumpers but not when connected, the fan relay is the most likely problem.
  4.  
  5. If fan operates but a high current draw is suspected continue with the following ammeter TESTING.
  6.  
  7. Disconnect the electrical connector from the cooling fan.
  8.  
  9. Using an ammeter and jumper wires, connect the fan motor in series with the battery and ammeter. With the fan running, check the ammeter reading, it should be 3.4-5.0 amps; if not, replace the motor.
  10.  
  11. Reconnect the fan's electrical connector. Start the engine, allow it to reach temperatures above 194°F and confirm that the fan runs. If the fan doesn't run, replace the temperature switch.
  12.  

 
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