Question about 2003 Jeep Grand Cherokee
Fan will not come on when sitting at idle and motor will overheat...hotwired fan motor and fan runs...how do i test the coolant temp sensor?
This is normally the fan relay which is fried. It can be that the fan is pulling too much current , which causes the relay to fry. It is a good thing to change both fan and relay.
If the sensor is faulty, then you won t see coolant temperature on the instrument panel.
Posted on Jun 16, 2014
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Posted on Jan 02, 2017
the aux fan only works when the ac is on, and has come to a predetermined temp(?) i found this out while going up a long grade in the back country without the ac on and later found out the radiator was half plugged!
Posted on Nov 22, 2008
There was a recall on this year Jeep GC. My limited 4.7L had to have the fan clutch replaced, but this was what the recall was for. Make sure that you check with your dealer to ensure your Jeep was included in the recall. Be careful where you take it as the dealer that replaced my fan clutch broke my rasdiator and I had to have the entire radiator replaced about 2 weeks after they did the work and they wouldn't cover any of it.
Posted on Feb 21, 2009
we have a 2003 and it did the very same thing . Its called cooling fan relay it costs about 60.00 and is located behind the headlight assembly . not very hard to fix if you know anything about cars .
Posted on May 07, 2009
When was the last coolant change?
Under 2 years or 24,000 miles.
Change the thermostat and gasket first.
Use a 195F with pop-let protection.
A stuck/failing thermostat is a common cause of over-heating problem.
To change the fan,the entire protector plastic has to come out.
Most likely you will break the push in locking pins.
Get few replacement push in locking pins before you start the job.
Posted on Dec 02, 2009
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