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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 1.8L PRIZM >> Cooling Fan Inoperative At Low Speed

Cooling Fan Inoperative At Low Speed

  1. Review DESCRIPTION , and then go to next step.
  2. Connect scan tool. Ensure engine is less than operating temperature. Move blower speed switch to any position except OFF. Depress A/C switch to ON position. Using scan tool, command A/C compressor clutch (MG) relay on. When MG relay is energized, cooling fans will also turn on at low speed. If cooling fans operate at low speed, problem is intermittent. If cooling fans do not operate at low speed, go to next step.
  3. Exchange fan 3 relay with a known good relay (fan 1 relay, A/C MG relay or horn relay). If cooling fans operate at low speed, go to step  8. If cooling fans do not operate at low speed, go to next step.
  4. Check fan 3 relay coil supply voltage circuit (Black/White wire) for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  5. Check fan 3 relay coil ground circuit (White/Black wire) for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  6. Check White/Red wire between fan 3 relay and fan 2 relay for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  7. Repair open in fan 3 relay switch supply voltage circuit (White wire). After repairs, go to step  9.
  8. Replace fan 3 relay. After repairs, go to next step.
  9. Operate system to verify repair.
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