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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 3.5L & 4.0L Aurora >> Cooling Fan Inoperative

Cooling Fan Inoperative

  1. If diagnostic system check has been performed, go to next step. If diagnostic system check has not been performed, see DIAGNOSTIC SYSTEM CHECK .
    2. NOTE: Cooling fan 1 relay and cooling fan 2 relay are improperly identified in underhood fuse block. See WIRING DIAGRAMS  for proper identification.
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, command fans low speed on and off. If low speed engine cooling fans turn on and off with each command, go to next step. If low speed engine cooling fans do not turn on and off with each command, go to step  4.
    3. NOTE: Before PCM changes speed of cooling fans, a 3-second delay occurs.
  3. Using scan tool, command fans high speed on and off. If high speed engine cooling fans turn on and off with each command, problem is intermittent. If high speed engine cooling fans do not turn on and off with each command, go to step  11.
    4. NOTE: Following this step, do not remove fused jumper (20-amp) connected during this step. While performing the following steps, use a second fused jumper (20-amp).
  4. Disconnect cooling fan 1 relay. Connect first fused jumper (20-amp) between battery positive voltage circuit of cooling fan 1 relay and motor supply voltage circuit (Gray wire) of cooling fan 1 relay. If both cooling fans operate at low speed, go to step  13. If both cooling fans do not operate at low speed, go to next step.
  5. Disconnect cooling fan series/parallel relay. Connect second fused jumper (20-amp) between right cooling fan low reference circuit (White wire) of cooling fan series/parallel relay and left cooling fan motor supply voltage circuit (Light Blue wire) of cooling fan series/parallel relay. If both cooling fans operate at low speed, go to step  14. If both cooling fans do not operate at low speed, go to next step.
  6. Connect second fused jumper (20-amp) between battery positive voltage circuit of cooling fan series/parallel relay and cooling fan motor supply voltage circuit (Light Blue wire) of cooling fan series/parallel relay. If left cooling fan operates at high speed, go to step  9. If left cooling fan does not operate at high speed, go to next step.
  7. Install cooling fan series/parallel relay. Disconnect left cooling fan electrical connector. Connect second fused jumper (20-amp) between terminals of left cooling fan electrical connector. If right cooling fan operates at high speed, go to step  16. If right cooling fan does not operate at high speed, go to next step.
  8. Connect second fused jumper (20-amp) between cooling fan motor supply voltage circuit (Light Blue wire) of left cooling fan electrical connector and ground. If right cooling fan operates at high speed, go to step  20. If right cooling fan does not operate at high speed, go to step  21.
  9. Install cooling fan series/parallel relay. Disconnect right cooling fan electrical connector. Connect second fused jumper (20-amp) between terminals of right cooling fan electrical connector. If left cooling fan operates at high speed, go to step  17. If left cooling fan does not operate at high speed, go to next step.
  10. Connect second fused jumper (20-amp) between battery voltage and right cooling fan low reference circuit (White wire) of right cooling fan electrical connector. If left cooling fan operates at high speed, go to step  18. If left cooling fan does not operate at high speed, go to step  22.
  11. If left cooling fan is operating properly at high speed, go to next step. If left cooling fan is not operating properly at high speed, go to step  15.
  12. Disconnect cooling fan series/parallel relay. Connect second fused jumper (20-amp) between right cooling fan low reference circuit (White wire) of cooling fan series/parallel relay and ground circuit (Black wire) of cooling fan series/parallel relay. If right cooling fan operates properly at high speed, go to step  14. If right cooling fan does not operate properly at high speed, go to step  19.
  13. Check cooling fan 1 relay connector for poor connections. If problem is found, repair as necessary. After repairs, go to step  28. If problem is not found, go to step  23.
  14. Check cooling fan series/parallel relay connector for poor connections. If problem is found, repair as necessary. After repairs, go to step  28. If problem is not found, go to step  24.
  15. Check cooling fan 2 relay connector for poor connections. If problem is found, repair as necessary. After repairs, go to step  28. If problem is not found, go to step  25.
  16. Check left cooling fan connector for poor connections. If problem is found, repair as necessary. After repairs, go to step  28. If problem is not found, go to step  26.
  17. Check right cooling fan connector for poor connections. If problem is found, repair as necessary. After repairs, go to step  28. If problem is not found, go to step  27.
  18. Repair right cooling fan motor supply voltage circuit (Gray wire). After repairs, go to step  28.
  19. Repair right cooling fan ground circuit (Black wire). After repairs, go to step  28.
  20. Repair left cooling fan ground circuit (Black wire). After repairs, go to step  28.
  21. Repair left cooling fan motor supply voltage circuit (Light Blue wire). After repairs, go to step  28.
  22. Repair right cooling fan low reference circuit (White wire). After repairs, go to step  28.
  23. Replace cooling fan 1 relay. After repairs, go to step  28.
  24. Replace cooling fan series/parallel relay. After repairs, go to step  28.
  25. Replace cooling fan 2 relay. After repairs, go to step  28.
  26. Replace left cooling fan. After repairs, go to step  28.
  27. Replace right cooling fan. After repairs, go to next step.
  28. Operate system to verify repair.
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