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Radiator Cooling Fan Inoperative

NOTE: Powertrain Control Module (PCM) monitors radiator cooling fan, cooling fan circuit and cooling fan relays and will store a Diagnostic Trouble Code (DTC) if a fault is detected. To diagnose an inoperative cooling fan, a Diagnostic Readout Box (DRB) scan tool, volt/ohm meter and vehicle wiring diagrams are required. If DTC P1489 or P1490 are present, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE to retrieve DTCs and for detailed testing procedures.
  1. Ensure all diagnostic trouble codes are repaired BEFORE diagnosing this symptom. Using DRB scan tool, activate low speed radiator fan relay. If radiator cooling fan operates, go to step  6 . If radiator cooling fan does not operate, go to next step.
  2. Turn ignition off. Locate power distribution center and remove low speed radiator fan relay. Using a DVOM connected to ground, measure voltage at relay cavity No. 88 (Red/Black wire). See Figure . If voltage reading is more than 11 volts, go to next step. If voltage reading is not more than 11 volts, repair power feed circuit (Red/Black wire). See WIRING DIAGRAMS  .
  3. Using a jumper wire, jumper across relay cavities No. 88 (Red/Black wire) and No. 80 (Dark Green wire). See Figure . If radiator fan operates, replace low speed radiator fan relay. If radiator fan does not operate, go to next step.
  4. Disconnect 3-pin radiator fan motor harness connector. Using a DVOM connected to ground, measure voltage at 3-pin radiator fan motor harness connector terminal No. 2 (Dark Green wire). See Fig 1 . If voltage reading is more than 11 volts, go to next step. If voltage is not more than 11 volts, repair open in Dark Green wire circuit. See WIRING DIAGRAMS  .
  5. Using a DVOM connected to ground, measure resistance at terminal No. 1 (Black wire) of 3-pin radiator fan motor harness connector. See Fig 1 . If resistance reading is less than 5 ohms, replace radiator fan motor. If resistance reading is not less than 5 ohms, repair open radiator fan motor ground circuit (Black wire). See WIRING DIAGRAMS  .
  6. Using DRB scan tool, activate high speed radiator fan relay. If radiator cooling fan operates, radiator fan is okay at this time. Check for an intermittent condition. If radiator cooling fan does not operate, go to next step.
  7. Turn ignition off. Locate power distribution center and remove high speed radiator fan relay. Using a DVOM connected to ground, measure voltage at relay cavity No. 98 (Red/Black wire). See Figure . If voltage reading is more than 11 volts, go to next step. If voltage reading is not more than 11 volts, repair Red/Black wire circuit. See WIRING DIAGRAMS  .
  8. Using a jumper wire, jumper across relay cavities No. 98 (Red/Black wire) and No. 90 (Light Green wire). See Figure . If radiator fan operates, replace high speed radiator fan relay. If radiator fan does not operate, go to next step.
  9. Disconnect 3-pin radiator fan motor harness connector. Using a DVOM connected to ground, measure voltage at terminal No. 3 (Light Green wire) of 3-pin radiator fan motor harness connector. See Fig 1 . If voltage reading is more than 11 volts, go to next step. If voltage reading is not more than 11 volts, repair open in Light Green wire circuit. See WIRING DIAGRAMS  .
  10. Using a DVOM connected to ground, measure resistance at terminal No. 1 (Black wire) of 3-pin radiator fan motor harness connector. See Fig 1 . If resistance reading is less than 5 ohms, replace radiator fan motor. If resistance reading is not less than 5 ohms, repair open in radiator fan motor ground circuit (Black wire). See WIRING DIAGRAMS  .
    Fig 1: Identifying Terminals Of Radiator Fan Motor Connector
    G00316153Courtesy of CHRYSLER CORP.
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