So I posted a while ago that my radiator was leaking due to a crack. It wasn't over heating, the fan was working and there was just a lot of radiator fluid coming out of the crack spilling a ton. I tried to do a JB Weld and it wouldn't hold after 2 failed attempts so I took it to get replaced. 2 days later I get my car back because of mishaps, they call and tell me that my car is over heating with the new radiator that it could either be the water pump, head gasket, or thermostat. (Luckily the thermostat fixed the problem) So I get my car back they tell me my fans motor is running a little weak and has a hard time kicking on that I would need to turn on the AC on high to get it to turn on sometimes. A couple days running fine no leaks its awesome. Yesterday I hit some traffic in the city for the first time and I noticed my temp gage started to shoot up the more I was stopped (moving I was fine the engine was getting air) so I turn on the AC on high and start moving again temp goes down. Show Today I was curious to see if the fan would kick on so I left the car running in the drive way with the hood open, car gets to about 215 and fan still hasn’t kicked on, gets to about 230 still nothing. I decide to turn on the AC on high and see if the fan kicks on. A couple minutes of that still nothing, so I turn the car off and let it relax before I start messing around seeing if they forgot to plug something in or what it could be, especially since it was working fine before I took it there and never overheated. (It did about 3-4 months ago once when the temp was extremely high outside, had AC on high and the windows down like an idiot as I rolled windows up it was fine). I called my mechanic and the owner of the place I asked them what is going on, I yelled at them (I’m really close to my mechanic been going there for 7 years done free repairs, taken really good care of me) they told me to bring it in tomorrow morning to take a look at it and see if they forgot to plug something in. Here is what I see: http://imgur.com/a/46gAK (When you are looking at the front of the car this is to the left side of radiator, near headlight area) I never noticed this before when I was working on it not sure what is going on. Any advice would be wonderful I have dropped a lot into my jeep the last 3 weeks and don't want to spend anymore ($700+ in misc repairs). I love my jeep but I guess it really is an acronym for Just Empty Every Pocket. Thanks for the help in advance! Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! ZJ (93-98), WJ (99-04), WK (05+) Fan Relay on 2004 Grand Cherokee
Newbie Thread Starter
Join Date: Sep 2016 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts Model: Cherokee
Can someone familiar with an '04 Grand Cherokee let me know their experience with the fan relay location? I've seen differing locations online (one behind the headlight, the other in the power distribution center). From what I gather online, 2004 was around the time that the location changed. So I came here to the Cherokee Forums to see if someone has experience with this! My question is, is there an easy way to tell? In other words, if there are high and low speed fan relays in the power distribution center, does that mean there is no PWM fan relay behind the bumper/headlight? For the background, my GC started overheating at idle. When I drive the temperature is in the normal range, but as soon as I stop driving the gauge starts rising. The fan turns freely so I don't think the fan motor is seized up but I'd like to try the logical fixes and save a buck if possible. Thanks in advance!
Senior Member
Join Date: Jan 2012 Posts: 952 Likes: 0 Year: 2004 Model: Grand Cherokee Engine: 2000 4.0
For 4.0 only:In PDC, 2 relays, location marked on cover....nothing behind headlight on 2004
Newbie Thread Starter
Join Date: Sep 2016 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts Model: Cherokee Thanks for that...do you have the exact name of the relay? When I look at Advance Auto or O'Reilly online and search for fan relay, it gives me the parts for the behind the headlight relay, even though I entered my vehicle info.
Senior Member
Join Date: Jan 2012 Posts: 952 Likes: 0 Year: 2004 Model: Grand Cherokee Engine: 2000 4.0 Quote: Originally Posted by BoSox 15 Thanks for that...do you have the exact name of the relay? When I look at Advance Auto or O'Reilly online and search for fan relay, it gives me the parts for the behind the headlight relay, even though I entered my vehicle info. Just unplug one of the relays (they are both the same) and take it to the parts house and let them match it up. It is just a generic relay. One relay is for low speed and the other is high speed....try switching them to see if fan comes on.
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Join Date: Sep 2016 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts Model: Cherokee Great thank you!
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Join Date: Sep 2016 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts Model: Cherokee Sorry for the multiple replies. I'm at work so I can't take a look until I get out but I just thought of this... If there are two relays, do they work independently? Even if one is defective shouldn't the other (high or low) kick on either way? In other words should the fan come on if one relay is inoperative? I'm just trying to troubleshoot what I can before I have to spend a lot of money.
Senior Member
Join Date: Jan 2012 Posts: 952 Likes: 0 Year: 2004 Model: Grand Cherokee Engine: 2000 4.0
Quote: Originally Posted by BoSox 15 Sorry for the multiple replies. I'm at work so I can't take a look until I get out but I just thought of this... If there are two relays, do they work independently? Even if one is defective shouldn't the other (high or low) kick on either way? In other words should the fan come on if one relay is inoperative? I'm just trying to troubleshoot what I can before I have to spend a lot of money. yes but high speed does not come until temp is above normal.
Member
Join Date: Aug 2014 Location: LAS VEGAS, NV Posts: 159 Likes: 0 Received 1 Like on 1 Post Year: 2004 Model: Grand Cherokee (WJ) Engine: 4.0 I6 I think I saw somewhere that the high speed should also come on anytime the a/c is on. Can someone confirm that?
Senior Member
Join Date: Jan 2012 Posts: 952 Likes: 0 Year: 2004 Model: Grand Cherokee Engine: 2000 4.0 Quote: Originally Posted by GUARDIAN
I think I saw somewhere that the high speed should also come on anytime the a/c is on. Can someone confirm that? Not correct. High speed fan is controlled by pressure switch located in refrigerant line at condenser....it does not run continuously when AC is on. It cycles on/off when AC high pressure demands it.
Newbie
Join Date: Sep 2018 Posts: 8 Likes: 0 Received 0 Likes on 0 Posts Model: Grand Cherokee (ZJ) Engine: v6 1 Last edited by powers01; 09-30-2018 at 01:03 PM. Reason: wrong thread
Old fart with a wrench
Join Date: Nov 2010 Location: Manlius, east of Syracuse, NY Posts: 14,398 Year: 2000 XJ Sport & WJ Laredo Model: Grand Cherokee (WJ) Engine: 4.0L
Newbie
Join Date: Oct 2018 Posts: 3 Likes: 0 Received 0 Likes on 0 Posts Model: Cherokee (XJ) I had this issue with the relays, I went to a mechanical fan off a Ford explorer, but it has to be the eleven blade fan so it fits into your fan shroud. It was a 4.0 liter ford explorer between 1998 and 2004. My Cherokee has ran at least 8 to 10 degrees cooler ever since.
Newbie
Join Date: Jan 2021 Posts: 9 Likes: 0 Received 1 Like on 1 Post Model: Cherokee (XJ)
Anyone ever swap a 91 4.0 into an 89 xj? I�ve been researching. Info is a little all over the place. Can�t find this specific swap. Missing it by a year or two. Looking for a write up. Or what changes need to made.
Newbie
Join Date: Aug 2019 Location: Arizona Posts: 2 Likes: 0 Received 0 Likes on 0 Posts Year: 1996 Model: Cherokee (XJ) Engine: 4.0 from a 94 grand cherokee dont know where to ask this so im trying here, i tried a new thread and that got nothing but related to this thread so here goes: I have a 2 door 96 XJ body with the engine bottom from a 97 XJ and the head from a 94 grand cherokee. Everything seemed to be working fine until the water pump went out on the freeway and by the time I noticed it over heating it was at 302 degrees F and started to loose power fast. I cut it off and coated to the side and with the help of some strangers got it off the freeway to safely in a parking lot then AAA got her home to assses the damages. what i found was #2 piston melted a hole down one side. besides a lot of burnt up oil baked on everything, all else seems to be ok. My 94 short block had #1 piston skirt and connecting rod break down and blew a hole out the side of the block and the pan but I still have the everything else which is why I used the head on the cheep 97 short block I got off of craigslist. My question is can I use a good piston from my 94 grand cherokee in my 97 XJ short block?
CF Veteran
Join Date: May 2012 Location: Lost in the wilds of Virginia Posts: 7,964 Year: 1998 Classic (I'll get it running soon....) and 02 Grand Model: Cherokee (XJ) Engine: 4.0 No, your question is NOT related to this thread. Not even A LITTLE BIT. As your question in the proper forum and have a little patience.
Thread Thread Starter Forum Last Post the9-5guy Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! 20 11-08-2020 08:40 AM Dean5420 Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! 1 10-27-2020 09:03 PM JimmyC1968 Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! 5 07-12-2014 10:34 AM elmorek12 Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here! 14 07-31-2011 11:11 AM 45shutr Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here 3 09-30-2010 11:33 PM Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) What can cause cooling fan to stop working?Your mechanic will look for one these common cooling fan faults:. Blown fuse. As the radiator fan is electrical, the problem could be with the fuse. ... . Faulty temperature sensor. ... . Defective fan relay. ... . A wiring issue. ... . Something wrong with the fan motor. ... . Low coolant level.. What are the symptoms of a faulty cooling fan switch?Common signs include engine overheating, the Check Engine Light coming on, and a broken or shorter signal wire.
Is there a relay for the radiator fan?The cooling fan relay is an electromagnetic switch that controls the power supply to the engine's cooling fans. It ensures that the energy-intensive devices only run when needed, usually when the vehicle is immobile.
Will the radiator fan work if temperature sensor is not working?The sensor reads the system's temperature and determines when to turn the fan on. If it isn't functioning properly, chances are that the fan won't turn on, and the vehicle may overheat as a result. That said, make sure to check the sensor found in the thermostat cover.
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2004 jeep grand cherokee cooling fan not working
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