Question about 2004 Jeep Grand Cherokee

2 Answers

Radiator fan not working replaced relay,temp

I have a 2004 Jeep Grand Cherokee that runs hot when sitting still sometimes. We have changed thermostat, relay, and flushed radiator. Fan works then doesnt. Collant wont go down when running and cap is off. We are frustrated and puzzled. Help!

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  • Samuel Charles Spriggs May 11, 2010

    Have you direct-wired the fan motor(s) to 12 volts (like the battery) to see how they function?

  • Anonymous Mar 29, 2014

    changed fan changed relay

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2 Answers

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  • Jeep Master
  • 5,568 Answers

You didn’t mention replacing the temperature sensor located on the block in the path of the ‘cooled’ coolant.
I can’t tell you any closer where to look for it since you didn’t specify which engine you have.
This device is a solid state item called a thermistor.
With the air temperature around 77 degrees F and a 'cold' engine, it should measure about 10,000 Ohms and hot, around 1,200 Ohms while disconnected from its mating connector.
With the ignition on, and the connector disconnected from the sensor, you should measure about 5 volts coming from the ECU.
If this has failed, the ECU is not getting the right info back from the sensor and doesn’t know if the fan is needed or not.
 

Posted on May 26, 2009

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  • Master
  • 335 Answers

The coolant fan must work anytime the computer tells it to. Temp from engine is monitered by the computer and the computer tells the fan relay to turn on the fan. This occurs when engine temp is about 225. If the fan does not want to work when asked, it could be the fan itself. PS I am not sure what you mean by coolant won't go down. If you fill the cooling system very slowly when the engine is cold, it should fill to normal.

Posted on May 26, 2009

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Posted on Jan 02, 2017

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