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Cooling Fan Operates Continuously

  1. Review DESCRIPTION , and then go to next step.
  2. Ensure Engine Coolant Temperature ECT is less than 199°F (93°C). Depress A/C switch to OFF position. Turn blower switch to OFF position. Turn ignition switch on. If only main fan motor is running continuously, go to step  4. If not only main fan motor is running continuously, go to next step.
  3. If only auxiliary fan motor is running continuously, go to step  8. If both fans are running continuously, go to step  11.
  4. Remove fan 1 relay from fuse and relay block 1. If main fan motor runs, go to next step. If main fan motor does not run, go to step  6.
  5. Repair short to voltage in main fan motor supply voltage circuit (Black/Red wire). After repairs, go to step  17.
  6. Check fan 1 relay control circuit (Blue/Black wire) for open. If problem was found, repair as necessary. After repairs, go to step  17. If problem was not found, go to next step.
  7. Replace fan 1 relay. After repairs, go to step  17.
  8. Remove fan 2 relay from fuse and relay block 2. If auxiliary fan motor runs, go to next step. If auxiliary fan motor does not run, go to step  10.
  9. Repair short to ground in White wire between auxiliary fan motor and fuse and relay block 2. After repairs, go to step  17.
  10. Replace fan 2 relay. After repairs, go to step  17.
  11. Remove fan 3 relay from fuse and relay block 2. If both fan motors run, go to next step. If both fan motors do not run, go to step  14.
  12. Check fan 2 relay control circuit (Blue/Black wire), including A/C refrigerant pressure switch, for open. If problem was found, repair as necessary. After repairs, go to step  17. If problem was not found, go to next step.
  13. Check ECT sensor for incorrect performance or for incorrect input to PCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If ECT sensor is operating correctly, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to step  17.
  14. Check A/C MG relay for continuity between terminals No. 3 (Black/White wire) and No. 5 (Blue/Red wire). Check fan 3 relay for continuity between terminals No. 3 (White/Red wire) and No. 5 (White wire). If continuity exists in either relay, go to next step. If continuity does not exist in either relay, go to step  16.
  15. Replace faulty relay. After repairs, go to step  17.
  16. Repair short to voltage in fan 3 relay coil supply voltage circuit (Black/White wire). After repairs, go to next step.
  17. Operate system to verify repair.
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