Question about 2000 Jeep Grand Cherokee

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My 2000 Jeep Grand Cherokee overheats in traffic

My 2000 Jeep Grand Cherokee overheats in traffic and the fan does not come on. The check engine light was on and I replaced the thermostat, the coolant temp sending unit and the fan relay switch. The check engine light went out, but it still overheats in traffic. If I'm moving, it's fine. Any ideas??

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Check the fuse for the fan and use a test light to make sure that the circuit is functioning. Warm up your car then feel along the top and bottom of the radiator to check for cold spots. If you find any then you may need to replace your radiator. If your heater isn't currently working it may be that since it is a part of your cooling system.

Posted on Apr 29, 2010

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I had the same problem with my Jeep Cherokee Laredo and I replaced the fan motor.. problem solved!

Posted on May 02, 2010

  • chkenwing May 29, 2010

    i have a 2001 doing the same thing the jeeps are know for the water pumps not going out but wearing down the fins in the water oump wearing down and slowing down the flow of water this was my prob 25 dollars for a water pump at auto zone

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You said something very important in your post. since you replaced the controls for the fan, have you checked to make sure the fan itself is good? You can easily test that by hot wiring it directly to the battery. If it fails to operate, replace it. Also check the outside of the radiator for obstructions such as bugs or leaves packed into the A/C condenser in front of the radiator or leaves stuck between the radiator and the condenser. If the radiator is internally blocked it is difficult to detect as most of the radiator is not accessible most shops use a heat sensing gun to check that.
If you decide to flush the system, flush the radiator separately from the engine as internal rust from the block will pack up in the radiator core and make the situation worse.
Another item to check is the clutch fan...It should not freewheel when the engine is hot.
The reason that it overheats in traffic is that in reality when at speed you don't need the fans...air flow caused by the speed of the vehicle is sufficient to keep everything cool. When in traffic you need fans to create that "wind" and any obstructions to the radiator become far more critical as Jeep radiators are borderline too small for the system in the first place.
Refrain from driving till you fix this as you can cause far worse problems (blown head gaskets) if it runs hot or overheats too many times.

Posted on Apr 29, 2010

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My engine overheat when A/C is running on a slow moving traffic or on parking.


I would check and see how much air is actually moving thru the radiator. The fan may not be running fast enough or you may have debris blocking the air flow. Also make sure the system is full of coolant and no air pockets.

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2000 Jeep GC, stalled in traffic, started later in day when cooler, very hot day, AC was off and not overheating, no problems before.


Could be a several things, start with the easiest first,

1. Thermostat (DIY for under $10.00)
2. Radiator Fan relay (DIY for under $50.00)
3. Water Pump (DIY for under $70.00)
4. Bad fan motor

Does your radiator fan run when AC is on or when engine is above 200F?

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2004 jeep grand cherokee overheating


check the thermostat or your radiator might be stopped up

Apr 14, 2010 | 2004 Jeep Grand Cherokee

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At this point you have a few items to check. 1. is there power at the fan, if you hot wire the fan to the battery does it come on? 2. is the relay good? (may be in front of battery or in power distribution center.) 3. Is the temperature sending unit good? sender send signal to computer, computer sends ground signal to relay that turns on fan. Also check main fuses in dist center.

Sep 30, 2009 | 2000 Jeep Grand Cherokee

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Is ther sencer that u can put in to have


yea.. coolant temp sensor. if you are over heating you may need more indepth tersts done to determine more precisely why so that the correct failed reason can be corrected. Sometimes a blown fuse will keep the fans from comming on. 210 is right about where u want the engine temp to be anyway.

Sep 23, 2009 | 2000 Jeep Grand Cherokee

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My 2000 jeep grand cherokee is overheating when i drive less than one mile and the coolant light is going off. i replaced the thermostat and checked the coolant level (which is fine) but it is still...


replace your cooling fan motor relay because if you dont eventually your radiator will explode and this will cause your engine block to crack and then if your fan isn't blowing the engine will continue to overheat and the engine will seize and then you need a new engine. A cooling fan motor relay is around $30.

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Over heating in stop and go traffic-1998 jeep cherokee 4.0 litre


If the electric cooling fan is inoperative, check the 15A fuse in the junction block and the 40A fuse in the Power Distribution Center (PDC) with a 12 volt test lamp or DVOM. Refer to the inside of the PDC cover for the exact location of the fuse.

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Apr 25, 2009 | 2000 Jeep Grand Cherokee

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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.

Mar 31, 2009 | 2001 Jeep Grand Cherokee

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