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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 >> 5.7L Corvette >> 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. Install scan tool. Turn ignition on, engine off. Using scan tool, command fan relay 1 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. Using scan tool, command fan relays 1, 2 & 3 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) 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 first fused jumper (20-amp) between battery voltage circuit of cool fan 1 relay and cooling fan motor supply voltage circuit (Light Blue 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 3 relay. Connect second fused jumper (20-amp) between left cooling fan low reference circuit (Gray wire) of cool fan 3 relay and right cooling fan motor supply voltage circuit (White wire) of cool fan 3 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 and cooling fan motor supply voltage circuit (White wire) of cool fan 3 relay. If right cooling fan operates in high speed, go to step  9. If cooling fan does not operate in high speed, go to next step.
  7. Install cool fan 3 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 in high speed, go to step  16. If left cooling fan does not operate in high speed, go to next step.
  8. Connect second fused jumper (20-amp) between cooling fan supply voltage circuit (White wire) of right cooling fan electrical connector and ground. If left cooling fan motor operates in high speed, go to step  20. If left cooling fan motor does not operate in high speed, go to step  21.
  9. Install cool fan 3 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 motor operates in high speed, go to step  17. If right cooling fan motor does not operate in high speed, go to next step.
  10. Connect second fused jumper (20-amp) between battery voltage and left cooling fan low reference circuit (Gray wire) of left cooling fan electrical connector. If right cooling fan operates in high speed, go to step  18. If right cooling fan does not operate in high speed, go to step  22.
  11. If right cooling fan operated in high speed, go to next step. If right cooling fan does not operate in high speed, go to step  15.
  12. Disconnect cool fan 3 relay. Connect a fused jumper (20-amp) between left cooling fan low reference circuit (Gray wire) of cool fan 3 relay and ground circuit (Black wire) of cool fan 3 relay. If left cooling fan operates properly in high speed, go to step  14. If left 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 3 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 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  26.
  17. 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  27.
  18. Repair left cooling fan motor supply voltage circuit (Light Blue wire). After repairs, go to step  28.
  19. Repair left cooling fan ground circuit (Black wire). After repairs, go to step  28.
  20. Repair right cooling fan ground circuit (Black wire). After repairs, go to step  28.
  21. Repair right cooling fan motor supply voltage circuit (White wire). After repairs, go to step  28.
  22. Repair left cooling fan low reference circuit (Gray wire). After repairs, go to step  28.
  23. Replace cool fan 1 relay. After repairs, go to step  28.
  24. Replace cool fan 3 relay. After repairs, go to step  28.
  25. Replace cool fan 2 relay. After repairs, go to step  28.
  26. Replace right cooling fan. After repairs, go to step  28.
  27. Replace left cooling fan. After repairs, go to next step.
  28. Operate system to verify repair.
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