Question about 2003 Jeep Grand Cherokee

3 Answers

03 grand cherokee, 4.0, rad fan will not run, checked fuses and replaced relay under headlight

Posted by on

  • mboyte68 Feb 07, 2010

    Thanks guys. Will try a jumper on cts.

×

Ad

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 677 Answers

These fan(s) run only when temp gets high enough for the sender to give the signal to the relay to apply 12 volts.
The fan(s) do not run all the time.
If you believe engine is overheating, and the fan(s) are not starting, then I would check the temp. sender

Posted on Feb 06, 2010

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 454 Answers

Check the coolant temperature switch. You should have 12V on one side of the switch. If you jumper the two wires in the switch connector, your radiator fan should run with the ignition switch on. If it runs, replace the coolant temperature switch.

Posted on Feb 06, 2010

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 306 Answers

May need a new temp sending unit. it tells the relay to turn on.

Posted on Feb 06, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Radiater fan stays on


Rad fan is triggered by a thermo switch via a relay. Find a relay in the fuze box marked for the fan , pull it,and see if the fan stops. If it does my guess is the contacts in the relay are stuck closed and running the fan.
Replace.

Oct 07, 2012 | 2001 Jeep Grand Cherokee

1 Answer

2003 Jeep Grand Cheeroke radiator fan runs when car is off draining battery. Could it be the relay? If yes is the relay in the fuse/relay box under the hood or under the passenger headlight?


After checking the conventional relays and fuses, we found an additional auxiliary cooling fan relay behind the front bumper. Once replaced, all is well.

The fan relay is likely shorted and keeping the fan motor energized; to check this you can remove the relays from the fuse panel... remove the cooling fan rely from the underhood PDC (Power Distribution Center). Fot this and additional fuse details, check this link: wjjeeps.com/fuses.htm

Hope helps.


Sep 11, 2011 | 2003 Jeep Grand Cherokee

1 Answer

Electric fan wont kick in jeep over heats replaced thermostat and two sender units


Sounds like your cooling fan relay is bad the jeep grand cherokees are known for this, first thing i would do is unplug the radiator cooling fan and run 2 jumper wires direct from the battery to the fan connector if the fan kicks on your fan motor is good and the relay is bad, if the fan doesnt kick on replace the fan motor with a new unit, the cooling fan relay on your particular model jeep is located under the passenger headlight and requires you remove the front bumper to replace it, however some people cut a small hole under the headlight to access the relay the faster way but if your not to keen on cutting holes in your car remove the bumper and replace the relay if the fan checks out and you wont be overheating anymore...

Dec 07, 2010 | 1999 Jeep Grand Cherokee

2 Answers

2003 Grand Cherokee need to install fan relay


is in the fuse panel either by under the hood is a black box ,were all the fuses are ,if not check the other panel inside the jeep by the driver side. good luck

Sep 15, 2009 | 2003 Jeep Grand Cherokee

2 Answers

2003 jeep grand cherokee radiator fan doesn't turn on


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.

Jun 28, 2009 | 2003 Jeep Grand Cherokee

2 Answers

OVERHEATING!! My 2000 Grand Cherokee is running hot. I have replaced the radiator cap, thermostat and water pump. There was a slow coolant leak which has ceased, but now the fan wont kick on, no matter how...


If there is not power at the cooling fan motor, then a likely cause is the cooling fan transistor (Relay) which is located bhind the front bumper underneathe the right headlight. The bumper must be removed to reach it, but many people cut a hole below the removed headlight to gain access.

Jun 21, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Radiator fan not working replaced relay,temp switch and fuse fan works if hot wired it's on a 2001 jeep grand cherokee


Check the wiring from the relay to the fan motor, and check the wiring from the fuse block. Basically check all wires that supply power to the fan motor, use a volt meter. Fan Relay (behind headlight, under battery) on the 2001 GC 4.0L are a piece of ****, I change mine almost yearly. The problem is their location, a high heat area prone to the elements. I understand that 2002 and newer, the location was changed and the problem solved. Relay might close the circuit when cold or at reasonable temps, but might open a circuit when it heats up, causing the problem.

Mar 28, 2009 | 2001 Jeep Grand Cherokee

3 Answers

Engine block does not heat up


Check the radiator fan relay. If it fails and leaves your fan running all the time, then you may never get hot.

Mine failed in my '03 Jeep Cherokee, but it failed open. Didn't make for a fun drive home. Was located behind the right headlight, and in order to access, had to drill a hole in the splash shield behind the headlight. Then plugged back up with a hole plug from the hardware store.

Oh, and the heater never really get's hot. I don't know what temp it get's to, but hot, like in my '01 Tahoe, it's not.

Feb 03, 2009 | 1996 Jeep Grand Cherokee

Not finding what you are looking for?
2003 Jeep Grand Cherokee Logo

278 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

yadayada
yadayada

Level 3 Expert

76109 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...