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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 >> 4.6L DEVILLE & SEVILLE >> Cooling Fan Inoperative

Cooling Fan Inoperative

NOTE: Cooling fan relay designation changes between 2000 and 2001 models. See RELAY IDENTIFICATION  table and WIRING DIAGRAMS  for relay identification.
RELAY IDENTIFICATION

Relay Designation Function
2000
Cool Fan 1 Relay High Speed Relay
Cool Fan 2 Relay Low Speed Relay
2001
Cool Fan 1 Relay Low Speed Relay
Cool Fan 2 Relay High Speed Relay
  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: On 2001 DeVille, 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 fan, a 3-second delay will occur.
  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 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 the cooling fan low speed relay. Connect fused jumper (20-amp) between battery voltage circuit of cooling fan low speed relay and cooling fan motor supply voltage circuit (Gray wire) of cooling fan low speed 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 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 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 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 in high speed, go to step  9. If left cooling fan does not operate in 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 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 (Light Blue wire) 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 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 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 (White wire) 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 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 in high speed, go to step  14. If right cooling fan does not operate properly in high speed, go to step  19.
  13. Check cooling fan low speed 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 cooling fan series/parallel 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 cooling fan high speed 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 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 low speed 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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