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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 >> 2.2L & 2.4L Cavalier & SUNFIRE >> 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 a scan tool. Turn ignition on, engine off. Using scan tool, command cooling fan on and off. If engine cooling fan turns on and off with each command, problem is intermittent. If engine cooling fan does not turn on and off with each command, go to next step.
  3. Turn ignition off. Remove cooling fan relay. Turn ignition on, engine off. Probe battery voltage circuit (terminal No. 30) of cooling fan relay switch side with test light connected to ground. If test light illuminates, go to next step. If test light does not illuminate, go to step  7.
  4. Connect fused jumper (20-amp) between battery voltage circuit (terminal No. 30) of cooling fan relay and cooling fan motor supply voltage circuit (terminal No. 87) of cooling fan relay. If cooling fan operates, go to step  10. If cooling fan does not operate, go to next step.
  5. Turn ignition off. Disconnect cooling fan connector. Turn ignition on, engine off. Probe cooling fan motor supply voltage circuit (Light Blue wire) at harness connector with test light connected to ground. If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Probe harness connector of cooling fan motor with test light between cooling fan motor connector terminals. If test light illuminates, go to step  11. If test light does not illuminate, go to step  9.
  7. Repair battery positive circuit (Red wire) of cooling fan relay. After repairs, go to step  14.
  8. Repair supply voltage circuit (Light Blue wire) of cooling fan motor. After repairs, go to step  14.
  9. Repair ground circuit (Black/White wire) of cooling fan motor. After repairs, go to step  14.
  10. Check cooling fan relay connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  12.
  11. Check cooling fan motor connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  13.
  12. Replace cooling fan relay. After repairs, go to step  14.
  13. Replace cooling fan motor. After repairs, go to next step.
  14. Operate system to verify repair.
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