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Home >> Chevrolet >> 2000 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 3.1L & 3.8L "W" Body (Grand PRIX) >> Cooling Fan Inoperative (3.8L)

Cooling Fan Inoperative (3.8L)

  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. 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. Disconnect cool fan 1 relay. Connect fused jumper (20-amp) between battery voltage circuit of the cool fan 1 relay and cooling fan motor supply voltage circuit (White wire) of cool fan 1 relay. If both cooling fans operate in low speed, go to step  11. If both cooling fans do not operate in low speed, go to next step.
    4. NOTE: Following this step, do not remove fused jumper (20-amp) that is connected during this step. While performing the following steps, use a second fused jumper (20-amp).
  4. Disconnect cool fan 1 relay. Connect fused jumper (20-amp) between battery voltage circuit of the cool fan 1 relay and cooling fan motor supply voltage circuit (White wire) of cool fan 1 relay. If both cooling fans operate in low speed, go to step  13. If both cooling fans do not operate in low speed, go to next step.
  5. Disconnect cool fan relay. Connect the second fused jumper (20-amp) between right cooling fan low reference circuit of cool fan relay and left cooling fan motor supply voltage circuit of cool fan relay. If both cooling fans operate in low speed, go to step  14. If both cooling fans do not operate in low speed, go to next step.
  6. Connect second fused jumper (20-amp) between battery voltage circuit of cool fan relay and cooling fan motor supply voltage circuit of cool fan relay. If left cooling fan operates in high speed, go to step  9. If left cooling fan does not operate in high speed, go to next step.
  7. Install cool fan relay. Disconnect left cooling fan electrical connector. Connect second fused jumper (20-amp) between cooling fan motor supply voltage circuit of left cooling fan electrical connector and cooling fan ground circuit of left cooling fan electrical connector. If right cooling fan operates in high speed, go to step  16. If right cooling fan does not operate in high speed, go to next step.
  8. Connect second fused jumper (20-amp) between cooling fan motor supply voltage circuit of left cooling fan electrical connector and ground. If right cooling fan operates in high speed, go to step  20. If right cooling fan does not operate in high speed, go to step  21.
  9. Install cool fan relay. Disconnect right cooling fan electrical connector. Connect second fused jumper (20-amp) between motor supply voltage circuit of right cooling fan electrical connector and low reference circuit of right cooling fan electrical connector. If left cooling fan operates in high speed, go to step  17. If left cooling fan does not operate in high speed, go to next step.
  10. Connect second fused jumper (20-amp) between battery voltage and right cooling fan low reference circuit of right cooling fan electrical connector. If left cooling fan operates in high speed, go to step  18. If left cooling fan does not operate in high speed, go to step  22.
  11. If left cooling fan is operating properly in high speed, go to next step. If left cooling fan is not operating properly in high speed, go to step  15.
  12. Disconnect cool fan relay. Connect second fused jumper (20-amp) between right cooling fan low reference circuit of cool fan relay and ground circuit of cool fan relay. If right cooling fan operates properly in high speed, go to step  14. If right cooling fan does not operate properly in high speed, go to step  19.
  13. Check cool fan 1 relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  28. If problem was not found, go to step  23.
  14. Check cool fan relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  28. If problem was not found, go to step  24.
  15. Check cool fan 2 relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  28. If problem was not found, go to step  25.
  16. Check left cooling fan connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  28. If problem was not found, go to step  26.
  17. Check right cooling fan connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  28. If problem was not found, go to step  27.
  18. Repair right cooling fan supply voltage circuit. After repairs, go to step  28.
  19. Repair right cooling fan ground circuit. After repairs, go to step  28.
  20. Repair left cooling fan ground circuit. After repairs, go to step  28.
  21. Repair left cooling fan supply voltage circuit. After repairs, go to step  28.
  22. Repair right cooling fan low reference circuit. After repairs, go to step  28.
  23. Replace cool fan 1 relay. After repairs, go to step  28.
  24. Replace cool fan relay. After repairs, go to step  28.
  25. Replace cool 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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