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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 >> 3.0L CATERA >> Auxiliary Cooling Fans Inoperative At Low Speed

Auxiliary Cooling Fans Inoperative At Low Speed

  1. Perform COOLING FAN SYSTEM CHECK . Go to next step.
  2. Turn ignition off. Connect fused jumper (5 amp) between fan control relay K26 diagnostic enable circuit (Brown/Blue wire) and ground. If auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 operate at low speed, go to next step. If auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 do not operate at low speed, see AUXILIARY COOLING FANS NO. 1 & 2 INOPERATIVE .
    3. 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.
  3. Remove fused jumper. Turn ignition on, engine off. Remove fan control relay K87. Check battery voltage circuit (terminal No. 4) of fan control relay K87 connector for open. If problem was found, repair as necessary. After repairs, go to step  11. If problem was not found, go to next step.
  4. Check ground circuit (terminal No. 6) of relay coil of fan control relay K87 connector for open. If problem was found, repair as necessary. After repairs, go to step  11. If problem was not found, go to next step.
  5. Start engine. Turn A/C compressor on. Connect test light between supply voltage circuit (terminal No. 2) of fan control relay coil of fan control relay K87 connector and ground. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  6. Check supply voltage circuit (Green wire) for open. If problem was found, repair as necessary. After repairs, go to step  11. If problem was not found, go to next step.
  7. See DIAGNOSTIC SYSTEM CHECK in appropriate AUTOMATIC A/C-HEATER SYSTEMS article. After repairs, go to step  11.
  8. Check supply voltage circuit (terminal No. 4) of auxiliary engine coolant fan 1 of fan control relay K87 connector for open. If problem was found, repair as necessary. After repairs, go to step  11. If problem was not found, go to next step.
  9. Check fan control relay K87 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  11. If problem was not found, go to next step.
  10. Replace fan control relay K87. After repairs, go to next step.
  11. Operate system to verify repair.
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