Question about 2004 Jeep Grand Cherokee

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1. The 2004 Jeep GC overheats while running and stopped. 2. The fan does not come on by itself, but when given a nudge (with a stick) it will start to spin. I watched the temp readings go up even with the fan running. The car will cool down when driving.

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Your fan likely needs to be replaced as it is not moving enough air to cool rad. When you are driving much more air is being forced thru rad.

Posted on Jul 29, 2010

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1 Answer

2004 jeep liberty not reading sensors


did you first check all fuses???? that be 1st !!!
dead cold engine, I OFF the rad cap, is the system full? of AF?
is the AF/ tested at 50% with the $2 tool? "prestone tool"
Does the AF coolant look like Mississippi mud?
AF= Antifreeze SOLUTION (coolant)

is this the 3.7L V6? , ????? that be first. what engine option. of 4.
even a 2.8L diesel.

no, the PCM is not the problem(CPU the brain) not at all.
unless the fans die... on 2.4L engine. got 2.4?
first tell us when it overheats. ?

parked. stopped only?
moving fast? ever? overheat.?
both ways?
Does the fan kick on , as the FSM tells you,.???

2 engines, have a viscous fan clutch others have electric fan
until you post engine. we can not help.

is the radiator fins clean? free of junk? front to rear.
if yes, it should not overheat moving fast.
if it only overheats parked, the fan is bad.
or clogged rad tubes... (easy test ask,with $15 pyro gun)

there is a start..

Jan 29, 2014 | 2004 Jeep Liberty

2 Answers

2004 jeep grand cherokee overheating


check the thermostat or your radiator might be stopped up

Apr 14, 2010 | 2004 Jeep Grand Cherokee

1 Answer

2001 Jeep GC Laredo - AC cold at higher speeds but blows warm air when stopped.


check to see if the radiator fans go on when the ac is on if not you will need to test for power at the fans this is not only a problem for the ac it can also cause the car to overheat

Sep 30, 2009 | 2001 Jeep Cherokee

1 Answer

04 Jeep Grand Cherokee Overheating


long answer but should get you solved.

You know for some reason jeep eliminated the FC relay for some models and now relies on the computer to determine when and at what speed the fan should run based on coolant temperature inputs and A/C compressor status. If the fan is not working properly i would consider replacing the fan,
"I have a 04 GC also with the 4.0 and I could not find my FC relay either. Nobody at a local dealer here had ever heard of this phantom FC relay problem. I was able to find an electrical diagram on the web that does not show the FC relay for the 04 GC but that was it. The diagram only showed the PCM and two relays in the PDC near the battery. My GC was overheating now and then. It would seem to overheat when you were in stop and go traffic or letting it idle. I was not losing any coolant so I replaced the thermostat but that did not fix it. After much frustration I started the engine and sat there and watched it run until it began overheating. I paid particular attention to the fan. When the engine began to overheat the fan was barely spinning and would even shut off at times during the overheating. I knew this was not right so that is when I began this search for the FC relay but I could not find it. I disconnected the fan and did some checking on the two speed electric radiator fan. It has a 3 pin connector where the center pin is ground. When I ran power to one pin and grounded the center pin the fan would run. However when I switched the power to the other pin I got nothing. I had already checked operation of the Low and High Speed relays in the PDC near the battery and all checked out so I went and picked up a new radiator fan assembly and installed it. That was yesterday and that fixed the overheating problem. I have concluded that for some reason jeep eliminated the FC relay for some models and now relies on the computer to determine when and at what speed the fan should run based on coolant temperature inputs and A/C compressor status. I also found out that although my GC does not have the towing package it does have the max cooling package. When I went looking for a new motor for the radiator fan at local auto parts store I was asked if it had the towing package and I answered no. Everytime I did they would bring out a motor that only had a 2 pin connector. Not one of them kept the motor that would be needed if you had the towing package. I bet if they did it would have a 3 pin connector on it. So while my GC does not have the towing package I think it has the max cooling package that usually comes with the towing package. I think the standard cooling package uses a one speed fan where the max cooling package uses a two speed fan. It may be that the standard cooling package uses the FC relay which is supposed to be under the passenger headlight but the max cooling package eliminates the relay and uses the PCM to control two relays in the PDC which in turn run the fan. One more thing....replacing the radiator fan assembly involves removing the shroud. One of the 4 screws that holds the shroud is in a very tight space. I fianlly got to it with a long socket extension and swivel. I know this is long but I hope it helps because I was very frustrated at the lack of informartion available locally and on the web in reference to this oddity" (article found on web)

Jun 30, 2009 | 2000 Jeep Grand Cherokee

3 Answers

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

2 Answers

Fan doesn't work


change the Radiator Fan

Nov 01, 2008 | 2004 Jeep Grand Cherokee

3 Answers

2004 Jeep wrangler 4.0 - 6cyl overheating


I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

Sep 02, 2008 | 2004 Jeep Wrangler

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