Question about 2003 Jeep Grand Cherokee

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2003 jeep grand cherokee radiator fan doesn't turn on

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Disconnect the fan plug and hot wire it to the battery if the fan dosen't run, replace it. Otherwise, check the relay. The system operates by the temp sender sending a signal to the computer that activates the relay that turns the fan on. Fan should also come on with A/C.

Posted on Jun 28, 2009

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It's your radiator fan relay switch. It's a common problem on 03 Jeep Grand Cherokee. Cheapest place to get the part is . It's an easy fix. Mine went out a couple months ago. It's behind the passenger side headlight. You have to take the headlamp out.

Posted on Jul 01, 2009

  • deschilz Jul 25, 2014

    Access to the fan relay is difficult in an un-modified jeep. See the following video for details:



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Posted on Jan 02, 2017

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SOURCE: Radiator fan will not turn off in my 2000 Jeep Grand Cherokee

usually the engine relay or cooling fan relay..!

Posted on May 08, 2009

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SOURCE: Radiator fan on 2003 grand jeep cherokee does not

Porbably the radiator cooling fan relay switch is bad; check it; this is located behind the bumper on the passenger side underneath the headlight.

There are two ways of accessing it: * Remove the bumper.
* Remove the pasenger side headlight assembly and cut a hole in the plastic underneatch click on the link below for more info: WJ site - Cooling Relay

The relay seems to be a common replacement item for this vehicle. One cause of the failure is that the relay overheats, per a note inserted in the replacement part packaging.

The cutout method is used by dealers. In one vehicle, the relay failed again after 40,000 miles or so. While replacing the relay it was noted that it was secured by one screw and it was not tight. This did not provide thermal contact with the chassis which helps cool the relay. The cause of the second failure was likely due to improper installation. Trying to work through a cutout would seem to make it difficult to get both screw isntalled securely. Furthermore, the new parts today use steel pop rivets for installation to help guarantee it will maintain proper thermal contact with the chassis. The pop rivets cannot be isntalled without removing the bumper.

It is not difficult to remove the bumper and grill to get to the relay. It sounds like a big deal but you are talking a half dozen screws and less than a dozen plastic rivets. The act of cutting a hole and working in cramped quarters has to be more difficult and it does not provide as quality a job.

Hope helps (remember rated this).

Posted on Jul 02, 2010

  • 1 Answer

SOURCE: Where is the fan actuator switch on a 2003 jeep

it is behind the right headlight. remove right lite small elect module under plastic bumper cover. check the connector from the module to the fan.
mine was melted & was losing connection when hot.Fix with wire connectors

Posted on Jul 05, 2010

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SOURCE: radiator fan motor on 2003 Jeep Grand Cherokee

I hope that you haven't went out and bought a whole new assembly due to the other poster's response. Yes you can just replace the motor otherwise why would you be able to buy the motors separately. There's usually 3 bolts that hold the fan shroud in that you have to remove along with the electrical plug. It takes some manipulation to get the entire fan/shroud assembly out (it helps to have someone underneath the vehicle guiding it) but once out you will see a clip over the top of the fan. It's kind of a challenge to get off but using a hammer and a flat head screwdriver you can work it off. Be aware that you have to put the clip back on so don't pry it off and ruin it....just kind of chisel it off. Once off, the fan blade comes off with a little effort. There's your exposed motor. Take off the 3 bolts and pull out the wires and replace it with your new motor. I hope this helps others....I couldn't find this information anywhere and figured it out along the way.

Posted on Jul 22, 2010

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2 Answers

P1491 diagnostics code for 2003 Jeep Grand Cherokee

Trouble Code: P1491 You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.

Radiator Fan Control Relay Circuit Malfunction
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Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test power to IGN) Radiator fan control relay is damaged or has failed PCM has failed

Nov 10, 2010 | 2003 Jeep Grand Cherokee

1 Answer

I have a 2003 Jeep Cherokee Laredo, 6 cyl, which has a 2 year old radiator, changed thermostat, water pump, the fan runs, and still overheats to the point the engine raddles and turns off. The radiator is...


Apr 19, 2010 | 2004 Jeep Grand Cherokee

2 Answers

2003 grand cherokee cooling fan not coming on , replaced thermostat. How do I determine if it's the fan relay?

the fan relay is very hard to get to! it's under the right hand side head light assembly.
you need to get to it to check the power to and from it when the engine is at the operating temperature.
a repair shop with proper equiptment can use a scan tool to demand the fan to turn on. if it does not turn on then the relay is bad, with condition that the fan is known good

Mar 09, 2010 | 2003 Jeep Grand Cherokee

3 Answers

Vehicle is overheating

electric fans or belt driven? if electric are they kicking on?

Feb 22, 2010 | 2003 Jeep Grand Cherokee

2 Answers

2003 Jeep Cherokee overheats when idling

usually its the fan itself, bearings likely got muddy... I have had that on a Cherokee and a liberty.

Aug 16, 2009 | 2003 Jeep Grand Cherokee

1 Answer

Radiator fan not turning motor fan just replaced

check the coolant fan switch. on 4 cyl. engines it 's mounted on the driver side of cylinder head. on 6 cyl. engines it's mounted on the intake manifold, just above the water pump.there will be 3 sensors,it will be the one on the left. good luck

Nov 29, 2008 | 2003 Jeep Grand Cherokee

2 Answers

2003 Jeep Grand Cherokee

Where is this fan located and what does it cool?

Oct 23, 2008 | 2002 Jeep Grand Cherokee

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