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Grand Cherokee

  1. Turn ignition on, with engine off. 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 connector. If test link blinks off and on, go to next step. If test light does not blink off and on, go to step  5 .
  3. Turn ignition off. Measure resistance between ground and Black/Pink wire at radiator fan motor 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 to radiator fan relay.
  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.
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