GM Storm/Spectrum 1985-1993 Repair Guide

Electric Fan

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REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable, then partially drain the engine cooling system to a level lower than the upper radiator hose.
  2.  
  3. Remove the upper radiator hose to provide access for fan and motor assembly removal.
  4.  
  5. Unplug the electrical connector(s) from the cooling fan motor. If multiple connectors are used, be sure to tag the wires before disconnecting.
  6.  
  7. Remove the fan shroud mounting, then remove the fan/shroud assembly from the vehicle.
  8.  
  9. If necessary, disassemble the fan and motor for repair or replacement.
    1. Remove the fan blade-to-motor nut, then separate the fan blade and washer from the motor.
    2.  
    3. Remove the motor-to-shroud bolts, then remove the the motor from the shroud.
    4.  

  10.  
  11. Test the fan motor and replace it, if necessary. Make sure the fan blades are free of damage or warpage and, replace if damaged.
  12.  


CAUTION
A fan that is damaged must be replaced to prevent possible failure and damage or injury.

  1. To install, reverse the removal procedures.
  2.  
  3. Connect the negative battery cable and refill the cooling system, then start the engine and check for leaks and proper fan operation.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the fan and motor assembly

FAN TESTING



Spectrum
  1. Unplug the electrical wiring connector from the electric cooling fan.
  2.  
  3. Using a 14 gauge wire, connect it between the fan and the positive terminal; the fan should run.
  4.  

If the fan does not run while connected to the electrical wiring connector with the engine warm and running, inspect for a defective coolant temperature switch or air conditioning relay, if equipped.

  1. If the fan does not run when connected to the jumper wire, replace the fan assembly.
  2.  

Storm

See Figure 2

  1. Unplug the wiring harness electrical connector from the cooling fan.
  2.  
  3. 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 5.8-7.4A, if the amp readings are not within specifications, replace the motor.
  4.  
  5. Reconnect the wiring harness to 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, test and/or replace the temperature switch.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: Testing the fan and motor assembly - Storm

THERMO SWITCH TESTING



See Figure 3

  1. Disconnect the negative battery cable and drain the engine cooling system. For the Spectrum, the system need only be drained to a level 1 / 2 way down the radiator, just below thermo switch mounted in the side of the radiator.
  2.  
  3. Unplug the electrical connector and remove the thermo switch from the side or base of the radiator, as applicable.
  4.  
  5. Suspend the a thermometer and the thermo switch in a pan containing a 50/50 mixture of ethylene glycol antifreeze and water. Do not let the switch or thermometer touch the bottom or sides of the pan to assure proper temperature readings.
  6.  
  7. Place the pan on a burner and raise the temperature above 179°F (82°C). As the temperature rises, use an ohm meter to check switch continuity. The switch should close providing continuity only after the specified temperature has been reached.
  8.  
  9. Replace the switch if it closes either too soon or too early.
  10.  



Click image to see an enlarged view

Fig. Fig. 3: Testing the thermo switch

 
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