LEMON Manuals: Even more car manuals for everyone
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 High Speed

Auxiliary Cooling Fans Inoperative At High Speed

  1. Perform COOLING FAN SYSTEM CHECK . Go to next step.
  2. Start engine. Turn A/C compressor on. With engine running, locate coolant fan test connector within ECM housing. Connect fused jumper between cooling fan relay control circuit (Brown/White wire) of coolant fan diagnostic enable circuit and ground. If auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 operate at high speed, go to step  4. If Auxiliary fan 1 and Auxiliary fan 2 do not operate at high speed, go to next step.
    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. Check auxiliary cooling fan relay control circuit (Brown/White wire) or coolant fan diagnostic enable circuit for open or high resistance. If problem was found, repair as necessary. After repairs, go to step  5. If problem was not found, replace fan control relay K28. After repair, go to step  5.
  4. Check A/C refrigerant pressure cycling switch signal circuit (Brown/White wire) or A/C refrigerant pressure cycling switch ground circuit (Black wire) for open or high resistance. If problem was found, repair as necessary. After repairs, go to next step. If problem was not found, replace A/C compressor refrigerant pressure switch. After repairs, go to next step.
  5. Operate system to verify repair.
scientia non olet · About LEMON Manuals