- #4502 of 4617
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Re: 2004 Jeep Grand Cherokee 4.0L Fan Relay Location [bbuchanan]
by dematel
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Jul 18, 2009 (1:44 pm)
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Replying to: bbuchanan (Mar 13, 2009 1:18 pm)
I have the same problem with Fan relay on my 2004 Grand Cherokee. I even took it to my mechanic because he did not believe me over the phone that I do not have any fan relay under the passenger light. There are only 3 holes and no sign of any relay or wires for it. Does any one else have any info that could help me figure it out where to look for that FAN RELAY ??? Thank you in advance.. Marcel
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- #4503 of 4617
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Re: Heater workes when it want's too.. [onecento1]
by its_jess
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Jul 19, 2009 (7:39 am)
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Replying to: onecento1 (Jan 04, 2009 10:14 am)
I wish I had more of an answer for you, but I'll give you what I have: I also have a 2003 JGC. I bought it used during mild weather, and like an idiot, never even checked the heat. The A/C seemed to work good. Along comes winter........and the heater blows just as cold as the A/C. At first, I would occasionally get some heat randomly upon starting the vehicle....but as soon as I touched any control knob, back to cold air. I researched this on-line, and to my dismay, found that this is actually a pretty common problem on the JGC once they hit 60-65K miles. Also discovered that it can be a $1500-$3,000 fix- the problem is with the "blend doors" that stop working correctly, and will eventually break and stick either in the open (nothing but heat) or closed (nothing but cold) position. The blend doors are a $300 part- the rest is in labor, as they have to remove the entire dash to fix it. My problem has only gotten worse- now the fan has quit, so now the A/C doesn't even work. I've seen that there is a kit you can purchase for $150-$300 (find them on Ebay) that is an alternative fix which involves cutting out the back of the glove box to access the original part. Apparently, after this fix you will get heat/A/C, but it bypasses some of the original automatic climate controls, leaving you with limited control. 
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- #4504 of 4617
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Re: Heater workes when it want's too.. [its_jess]
by topat46
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Jul 20, 2009 (4:33 am)
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Replying to: its_jess (Jul 19, 2009 7:39 am)
I had the same problem when I purchased my 2004 JGC Limited. It was purchased last August. It was a trade-in at a Mecedes dealer. The A/C worked fine (at least I thought it did). In September we had a one day cold snap so I tried the heater. Only cold air came out. I found out as you did that the blend-doors are a problem on these cars and the dealer wants an arm and a leg to repair it. After some searching I found the kit with the fix behind the glove compartment and installed it. It's now 10 months since the installation and everything is still fine. The climate control works as designed for both the driver and passenger side. I also had a problem with the blower-motor harness which I purchased at the dealer for $25 and replaced it myself. The kit for the blend-doors were purchased on E-Bay. There are two kits available. One gives you back full control of the system while the other gives you control with one dial. You should check the fault codes to be sure the problem is with the blend doors. I hope my experience helps you.
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- #4505 of 4617
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Re: Heater workes when it want's too.. [topat46]
by mnwilly
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Jul 20, 2009 (8:35 am)
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Replying to: topat46 (Jul 20, 2009 4:33 am)
Thanks for your help! I appreciate it.
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- #4506 of 4617
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Re: Heater workes when it want's too.. [mnwilly]
by smokebee
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Jul 20, 2009 (11:59 am)
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Replying to: mnwilly (Jul 20, 2009 8:35 am)
I, too had a similar problem. It turned out that the control door motor was stuck. Drop the glove bos door by opening it, feel along the top edges for two" ears". Manipulate those ears to align with slots in frame work. Pull the glove door all the way down. You will be able to see the motor housing near the left side of the dropped door. Two screws hold the motor in place, remove them and slip the housing off the shsft on the door flap. Test the door flap by twisting the exposed shaft. If it is free---do this(just be sure the door flap shaft is in same position as was at start). leave the electrical connection connected. Remove the screws holding the top of the motor housing--keeping it in upward postion. This will expose the gearing system which is driven by a tiny motor and worm gear shaft. . Turn the ingition switch on--rotate the heater door postion switch while watching the gear train.( If it moves you need to look somewhere else) If it does not moveYou will need to remove three gears to enable removal of the tiny motor(carefully note gear positions--they need to go back exactly as removed).Again do the igntion and control knob bit. If the motor does not spin-- Lift the motor out(after removing the two screws) and manually turn the shaft with fingers until it turns freely. put it back in and again do the ign and control knob( move from position to position, slowly). If it spins you have corrected the cause of no control position. Carefully replace the gears, top of motor and slide motor back onto housing shaft. Check it out. This corrected my problem. It's the pits doing it but hell of a lot cheaper.
Smokebee
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- #4507 of 4617
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can't shift gears
by smithed
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Jul 25, 2009 (4:51 pm)
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2005 rear wheel (2X4) v6
Today wouldn't shift into park, RND were fine. I drove it home.
Now won't shift out of R. Can't get it into neutral to start it. Shifter will move down to N and D, but remains in R. Will not go into P. 
Thanks for any ideas.
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- #4508 of 4617
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Re: 2004 Jeep Grand Cherokee 4.0L Fan Relay Location [dematel]
by mrspanky
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Jul 26, 2009 (6:10 am)
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Replying to: dematel (Jul 18, 2009 1:44 pm)
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.
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- #4509 of 4617
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1999 Jeep Grand Cherokee equipped w/Auto Headlight Feature)
by veeto
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Jul 26, 2009 (4:49 pm)
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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??
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- #4510 of 4617
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Re: Head Light Flickering Problem [jmbjasilli]
by jorgevargas
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Jul 26, 2009 (7:58 pm)
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Replying to: jmbjasilli (Jan 10, 2008 6:57 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!
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- #4511 of 4617
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Re: 2004 Jeep Grand Cherokee 4.0L Fan Relay Location [mrspanky]
by smokebee
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Jul 27, 2009 (10:30 am)
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Replying to: mrspanky (Jul 26, 2009 6:10 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.
Smokebee
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