Last post on Dec 05, 2013 at 7:03 AM
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Jeep Grand Cherokee, Jeep Cherokee, SUV
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#4508 of 5143 Re: 2004 Jeep Grand Cherokee 4.0L Fan Relay Location [dematel]
Jul 26, 2009 (6:10 am)
dematel....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.
#4509 of 5143 1999 Jeep Grand Cherokee equipped w/Auto Headlight Feature)
Jul 26, 2009 (4:49 pm)
Has anyone experienced these problems and if so, are they related and what is the solution? (My best guess is that it is related to the Automatic Headlight On feature.)
(1) When the vehicle is parked with no key in the ignition, the headlights come on, stay on for less than a minute, then go out.
(2) When driving the vehicle during the day (with the auto headlamp control in the "Auto" position), it seems as if the headlights flicker on, then off intermittently.
Any ideas on what my problem is??
#4510 of 5143 Re: Head Light Flickering Problem [jmbjasilli]
Jul 26, 2009 (7:58 pm)
I had the same problem, this has happened twice in a period of one year, the first time it happened, I found the right headlight plug to be shorted(black melted plastic). So I replaced that, now I wonder if that was the problem because this time is fine. I recently replaced the battery. Any suggestions are welcomed. Thanks!
#4511 of 5143 Re: 2004 Jeep Grand Cherokee 4.0L Fan Relay Location [mrspanky]
Jul 27, 2009 (10:30 am)
On a 99 --4.0 engine--electric fan drive---the fan starts at 217 F temp and stops at 208
F degrees. Might check radiator coolant temp to verify high enough temp to turn fan on. The fan relay is located in the same control center(box) as the fuses--passenger side ajacent to fender just in front of the coolant tank.
#4512 of 5143 Radiator Fan blowing 50A fuse
Jul 27, 2009 (11:00 pm)
I have an '06 JGC, and it seems like every time it gets hot here (90+), when the radiator fan tries to kick on it blows the fuse (which then gives me P0480 and P0481 DTCs -- this sort of sucks because then the A/C won't kick on).
Short in the radiator fan? -- any other ideas?
#4513 of 5143 radiator fan blowing fuse
Jul 28, 2009 (6:49 am)
Have you manually inspected the fan ? Does it turn freely in off mode? Perhaps a piece of trash has it locked down??
#4514 of 5143 4 wheel drive problem
Jul 28, 2009 (9:57 am)
1989 jeep cherokee, it's a deer lease limo. All is going fine until I try and shift into 4 wheel (high or low) the gears engage but not the front axle. There is no slipping or grinding going on, it drives normal in 4 wheel mode (high or low). What could be causing this? What is the fix to this issue? Has anyone else had this happen to their cherokee?
#4515 of 5143 Re: 1999 Jeep Grand Cherokee equipped w/Auto Headlight Feature) [veeto]
Aug 06, 2009 (6:50 am)
I currently have 2 of these. One does this same thing. It only happens occasionally and is most noticeable at night (obviously). The lights will come on, turn on the motion sensors on the porch, then go off. It is like it is possessed! It has helped to turn off the Auto Headlight function, but that is a pain.
#4516 of 5143 '04 JGC over-heating
Aug 16, 2009 (7:25 pm)
I am having issues with my 04 JGC overheating when I am going to slow and idling. I doesn't get hot as fast when I put in neutral when idling though. Really what I want to know is where is the thermastat at and how do I remove it? I need to see if the is the problem.
Aug 19, 2009 (3:35 am)
Where is the liftgate sensor locatedon a 1993 Cherokee? I also need to know where the body control module warning buzzer is, because it wont stop and its driving me crazy! The liftgate sensor says the liftgate is not latched even when it is, so i need to either repair the door sensor or rip out the alarn buzzer. Any help would be greatly appreciated.