Tip & How-To about Jeep 2002 Grand Cherokee Laredo 4WD

Jeep overheating?

On the 99'-04' jeep grand cherokee they are notoriously known for the radiator fan not running thus causing overheating, it's a well hidden relay under the passenger side headlight that is most likely bad, relay costs about 45 dollars give or take a few dollars, but make sure relay comes with harness that it plugs into because that was the actual factory defective part, just cut off old harness and match wires and replace harness along with relay switch and you should be good for years to come.

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it overheats when in traffic ior when it is idling


I have fixed my own 2002 Jeep Cherokee twice for the overheating issue. Overheating can be caused by a number of different problems, but one of the most notorious problems for the Jeep is the 'radiator fan relay switch'. When the temperature thermostat goes over 210, it tells the relay switch to turn on the radiator fan to cool down the engine. If that relay switch isn't working, the fan never turns on and thus your engine overheats. Here's a simple test to check if this is your overheating problem:
1. Start up your Jeep, open the hood, and let it run to the point where the temperature gauge on your dashboard creeps past 210.
2. Once it goes past 210, go over to the engine and see if the radiator fan kicked on. (the radiator fan is right behind the grill, circular with big plastic blades) If yes, then the relay switch is working. If no, then you probably need to replace the relay switch or the radiator fan motor is bad. But more than likely, it's the notorious relay switch.
3. Turn off the Jeep asap to avoid damaging the engine.

You can purchase a 'radiator fan relay switch' from most Jeep dealerships if they have a service dept. It should be around $75.
(I saved over $700 by not taking my Jeep to an auto shop to fix this) To change out the relay switch, you need to take off the passenger side front headlight. There's a black plastic guard behind the headlight and the relay switch is located under/behind that guard. If your Jeep ever experienced this problem before, you may see a cut-out where someone replaced this part before. If there's no cut-out, you can check out this link to see a picture of where to cut.
http://rigs.corequipment.com/cebby_WJsite/cooling.htm#relay

Once you switch out the part, you should be golden.

Mar 24, 2011 | 2003 Jeep Grand Cherokee

3 Answers

1995 Jeep Cherokee Sport. Keeps overheating. Replaced water pump, hoses, thermostat and belt. Runs between 220 & 240 without a/c on. Have been told it is either the coolant sensor or the fan clutch. Do not want to buy parts I don't need. Advice?


Clutch Fan are known to fail over time, but I wold not rule out the radiator. The small passages inside the radiator will clog due to age. You did not mention how many miles are on the Jeep or if the Aux fan is kicking on.

Jun 28, 2010 | 1995 Jeep Cherokee

3 Answers

2001 Jeep Grand Cherokee- fan that sits closest to radiator


Have you tested the fan sending unit on the engine? disconnect that and if the fan runs (Key on) that is most likely the problem.

Oct 17, 2008 | 2001 Jeep Grand Cherokee

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