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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 >> 2.4L, 3.1L & 3.4L ALERO, Grand Am & MALIBU >> Cooling Fan Inoperative

Cooling Fan Inoperative

  1. If diagnostic system check has not been performed, see DIAGNOSTIC SYSTEM CHECK . If diagnostic system check has been performed, go to next step.
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, command fans low speed on and off. If low speed cooling fans turn on and off with each command, go to next step. If low speed 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 will occur.
  3. Using scan tool, command fans high speed on and off. If high speed cooling fans turn on and off with each command, problem is intermittent. If high speed cooling fans do not turn on and off with each command, go to step  13.
  4. Turn ignition off. Disconnect cooling fan 1 relay. Turn ignition on, engine off. Probe battery voltage circuit of cooling fan 1 relay switch side using test light connected to ground. If test light illuminates, go to next step. If test light does not illuminate, go to step  20.
  5. Connect fused jumper (20-amp) between battery voltage circuit of cooling fan 1 relay and cooling fan motor supply voltage circuit (Light Blue wire) of cooling fan 1 relay. If both cooling fans operate in low speed, go to step  15. If both cooling fans do not operate in low speed, go to next step.
  6. Leave fused jumper wire in place of cooling fan 1 relay. Remove cooling fan series/parallel relay. Connect fused jumper (20-amp) between left cooling fan motor low circuit (White wire) of cooling fan series/parallel relay and right cooling fan motor supply voltage circuit (Black wire for Alero and Grand Am or Gray wire for Malibu) of cooling fan series/parallel relay. If both cooling fans operate in low speed, go to step  16. If both cooling fans do not operate in low speed, go to next step.
  7. Leave fused jumper wire in place of cooling fan 1 relay. Connect fused jumper (20-amp) between battery voltage circuit of cooling fan series/parallel relay and cooling fan motor supply voltage circuit of cooling fan series/parallel relay. If right cooling fan operates at high speed, go to step  11. If right cooling fan does not operate at high speed, go to next step.
  8. Leave fused jumper wire in place of cooling fan 1 relay. Install cooling fan series/parallel relay. Disconnect right cooling fan connector. If left cooling fan operates at high speed, go to step  24. If left cooling fan does not operate at high speed, go to next step.
  9. Leave fused jumper wire in place of cooling fan 1 relay. Connect fused jumper (20-amp) between right cooling fan motor harness connector terminals. If left cooling fan operates at high speed, go to step  18. If left cooling fan does not operate at high speed, go to next step.
  10. Leave fused jumper wire in place of cooling fan 1 relay. Connect fused jumper (20-amp) between cooling fan motor supply voltage circuit at right cooling fan harness connector and ground. If left cooling fan operates at high speed, go to step  23. If left cooling fan does not operate at high speed, go to step  24.
  11. Leave fused jumper wire in cooling fan 1 relay. Install cooling fan series/parallel relay. Disconnect left cooling fan connector. Connect fused jumper (20-amp) between left cooling fan motor harness connector terminals. If right cooling fan operates at high speed, go to step  19. If right cooling fan does not operate at high speed, go to next step.
  12. Leave fused jumper wire in place of cooling fan 1 relay. Connect fused jumper (20-amp) between battery voltage and left cooling fan motor connector terminal "A" (White wire). If right cooling fan operates at high speed, go to step  21. If right cooling fan does not operate at high speed, go to step  25.
  13. If right cooling fan operates properly at high speed, go to next step. If right cooling fan does not operate properly at high speed, go to step  17.
  14. Remove cooling fan series/parallel relay. Connect fused jumper (20-amp) between left cooling fan low circuit (White wire) at cooling fan series/parallel relay and ground circuit (Black wire) at cooling fan series/parallel relay. If left cooling fan operates properly at high speed, go to step  16. If left cooling fan does not operate properly at high speed, go to step  22.
  15. Check cooling fan relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  31. If problem was not found, go to step  26.
  16. Check cooling fan series/parallel relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  31. If problem was not found, go to step  27.
  17. Check cooling fan 2 relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  31. If problem was not found, go to step  28.
  18. Check right cooling fan connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  31. If problem was not found, go to step  29.
  19. Check left cooling fan connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  31. If problem was not found, go to step  30.
  20. Repair battery voltage circuit of cooling fan 1 relay, switch side. After repairs, go to step  31.
  21. Repair left cooling fan supply voltage circuit (Light Blue wire). After repairs, go to step  31.
  22. Repair left cooling fan ground circuit (Black wire between underhood fuse block and ground). After repairs, go to step  31.
  23. Repair right cooling fan ground circuit (Black wire). After repairs, go to step  31.
  24. Repair right cooling fan supply voltage circuit (Black wire for 2000 Alero and Grand Am, Gray wire for all others). After repairs, go to step  31.
  25. Repair left cooling fan low circuit (White wire). After repairs, go to step  31.
  26. Replace cooling fan 1 relay. After repairs, go to step  31.
  27. Replace cooling fan series/parallel relay. After repairs, go to step  31.
  28. Replace cooling fan 2 relay. After repairs, go to step  31.
  29. Replace right cooling fan. After repairs, go to step  31.
  30. Replace left cooling fan. After repairs, go to next step.
  31. Operate system to verify repair.
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