LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2001 >> Cherokee Classic, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Miscellaneous Controls >> Checking Radiator Fan Operation >> Grand Cherokee (4.0L)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Grand Cherokee (4.0L)

NOTE: Grand Cherokee 4.7L is equipped with a hydraulic cooling module consisting of a hydraulic fan control solenoid, hydraulic fan drive assembly and radiator fan blade. For testing, see DTC P1499: HYDRAULIC FAN SOLENOID under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - GRAND CHEROKEE article.
  1. Turn ignition on. Using scan tool, actuate radiator fan relay. Check radiator fan operation. If radiator fan cycles on and off, no problem is indicated at this time. Test is complete. If radiator fan does not cycle on and off, go to next step.
  2. Ensure radiator fan relay is still actuated. Using a test light connected to ground, backprobe Dark Green wire at radiator fan motor harness connector. If test link flashes on and off, go to next step. If test light does not flash on and off, go to step  5 .
  3. Turn ignition off. Measure resistance between ground and Black/Pink wire at radiator fan motor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Pink wire between radiator fan motor and ground connection.
  4. At this time, radiator fan motor is assumed to be defective. Replace radiator fan motor.
  5. Turn ignition off. Disconnect radiator fan relay connector. Relay is located in right front corner of engine compartment. Measure voltage between ground and Gray wire at radiator fan relay connector. If battery voltage is present, go to next step. If battery voltage is not present, repair open power circuit (Gray wire) to radiator fan relay. Also check fuse No. 10 (40-amp) in Power Distribution Center (PDC). PDC is located in right side of engine compartment, next to battery.
  6. Measure resistance of Dark Green wire between radiator fan relay and radiator fan motor. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green wire.
  7. At this time, radiator fan relay is assumed to be defective. Replace radiator fan relay.
scientia non olet · About LEMON Manuals