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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 High Speed Inoperative

Cooling Fan High 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. Turn ignition on, engine off. Remove fan control relay K67. Check diagnostic enable circuit (Brown/White wire) of relay K67 for open. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  3. Check ignition voltage supply circuit (terminal No. 2) of K67 relay for open. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  4. Check control circuit (terminal No. 6) of K67 relay for open. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  5. Check battery voltage circuit (terminal No. 4) of relay K67 for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  6. Connect fused jumper (20-amp) between battery voltage circuit (terminal No. 4) of fan control relay K67 and electric cooling fan motor supply voltage circuit (terminal No. 8) of fan control relay K67. If electric cooling fan operates at high speed, go to next step. If electric cooling fan does not operate at high speed, go to step  9.
  7. Check fan control relay K67 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
    8. 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.
  8. Replace fan control relay K67. After repairs, go to step  13.
  9. Remove fused jumper (20-amp). Disconnect electric cooling fan connector. Check supply voltage circuit (Red/White wire) of electric cooling fan motor for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  10. Check ground circuit (Black wire) of electric cooling fan motor for open. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  11. Check electric cooling fan motor connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to next step.
  12. Replace electric cooling fan motor. After repairs, go to next step.
  13. Operate system to verify repair.
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