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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 3.0L CATERA >> Cooling Fan Low Speed Inoperative

Cooling Fan Low Speed Inoperative

  1. Perform COOLING FAN SYSTEM CHECK . Go to next step.
    2. CAUTION: Installation of proper relay is critical. If an enhanced relay (equipped with a diode) is installed into a position requiring a standard relay (equipped without a diode) excessive current will damage any components associated with relay or its associated circuits.
  2. Remove fan control relay K26. Check diagnostic enable circuit (Brown/Blue wire) of fan control relay K26 for open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  3. Check battery voltage circuit (terminal No. 3) of relay coil of fan control relay K26 for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  4. Check battery voltage circuit (terminal No. 2) of auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 of fan control relay K26 for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  5. Check battery voltage circuit (terminal No. 4) of electric cooling fan of fan control relay K26 for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  6. Connect fused jumper (20-amp) between battery circuit (terminal No. 4) of fan control relay K26 and electric cooling fan motor supply voltage circuit (terminal No. 5) of fan control relay K26. If electric cooling fan operates at low speed, go to next step. If electric cooling fan does not operate at low speed, go to step  9.
  7. Check fan control relay K26 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  8. Replace fan control relay K26. After repair, go to step  16.
  9. Check supply voltage circuit (Red/Blue wire) of engine coolant fan resistor for open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  10. Check supply voltage circuit (Red/White wire) of electric cooling fan for open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  11. Check ground circuit (Black wire) of electric cooling fan for open. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  12. Check integrity of engine coolant fan resistor. If engine coolant fan resistor is okay, go to step  14. If engine coolant fan resistor is not okay, go to next step.
  13. Replace engine coolant fan resistor. After repairs, go to step  16.
  14. Check electric cooling fan motor connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  16. If problem was not found, go to next step.
  15. Replace electric cooling fan motor. After repairs, go to next step.
  16. Operate system to verify repair.
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