Question about 2001 Jeep Grand Cherokee

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Engine overheating My 2001 Jeep Gr. Cher. Larado overheats when stopped. The fan checks good. I just replaced the fan relay switch. Still doesn't work. What next?

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  • John Waksmunski Jul 22, 2009

    The fan works when tested but not when the car is stopped.

  • John Waksmunski Jul 26, 2009

    Now after replacing the fan, relay and sensor, not only is the car still overheating but NOW the Malfunction Indicator Light is on the dash. What now?

  • John Waksmunski Jul 27, 2009

    The engine ONLY overheats when stopped.

  • John Waksmunski Jul 27, 2009

    The engine ONLY overheats when stopped. The Malfunction Indicator Light on the dash is now ON all the time.

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Try to flush the system And inspect radiator. When moving the engine is also cooled by air. Make sure the water is circulating trough the manifold and the heater core. You can do this by atching a garden hose to each hose one at a time. You may also want to check the waterpump & thernostat..

Posted on Jul 22, 2009

  • CdRon Jul 26, 2009

    Sounds like you have a blockage in the radiator intake manifold or the heatercore. Check it out by forcing water through each component with a garden hose. Tape the hose with duct tape if you have too..

  • CdRon Jul 27, 2009

    You have to just check one component at a time go to www.autozone.com put in the make Year and model of your Jeep and click repair info or troubleshooting. They will give you ways to test everything. I believe there is not good waterflow, it could be something as small as the thermostat...

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I had a similiar problem with 2001 cherokee limited. It didn't overheat driving it, just while it sat and idled. The fan wasn't working.......but it wasn't the fan, it was a fuse! No problem now.

Posted on Jul 27, 2009

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2 Answers

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.

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1 Answer

My 01 Jeep Gr. Cher. radiatot fan doesn't work. The motor checks good and the fuse is good. What's next and how to do it?


O man ok you need to check the fan relay they fail all the time. It is located under the passenger side headlamp. remove the headlamp. you have to cut a small hole in the plastic molding about 2x2 inch square should do it. replace the relay u should be good to go. They run about 50 dollars at the dealer. I think they are the only ones that carry them. Hope that helps.

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Cost to replace rear main seals on 2001 jeep gr. cher. ltd.


Actually yeah you are in luck that combination only requires dropping the oil pan. The seal is actually fairly easy to do it yourself, if your inclined. Parts about $20.00 and it's book rate is 5 hours. around here shops charge around $85/hour. About $500.00 out the door or under $50.00 if you want to get greasy. Here's a good picture guided step by step on a Jeep CJ with a 4.0 liter, yours is pretty much the same:

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2001 Jeep Grand Cherokee Laredo Overheating


Three possible solutions:

1. Bad Thermostat

2. Fan Relay (most likely)

3. Bad Fan

When the GC reaches a temp of 180 Deg. F the fan relay sends a signal to the fan to turn on, once the temp lowers (around 155 Deg. F) the relay turns off the fan, and so the cycle continues. If the relay is bad there will be no signal to the fan to run. While you are driving your vehicle there is ambient air moving thru the radiator, cooling the engine, but once you encounter slow/heavy traffic or stop there is no air moving and the temp goes up, the fan will not kick in and the vehicle will overheat.

If the fan motor is not working the same will happen, but a more expensive fix, as the motor comes with the fan.

If the Thermostat is stuck in the open position, the water travels to fast in the engine and heat exchanging is not an efficient process, therefore the vehicle might overheat when stopped or in slow traffic.

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