Go Back   Jeep Garage - Jeep Forum > Jeep Technical Discussion > Troubleshooting/Problems Discussion

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 08-28-2013, 11:22 AM
New Member
 
Join Date: Aug 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dustincstn82 is on a distinguished road
WJ Raditor fan relay woes

My girlfriends 1999 4.0 had a relay go out and I've tried both that are available from Autozone and they don't last more than a week. I've even installed a heatsink to keep this from overheating because I saw that this was a problem for the relay. Iat this point I'm worrying that either a Jeep brand relay is the difference or I need to chase for a short. Any help here towards the typical problem would be great!
__________________

__________________
Reply With Quote
  #2  
Old 08-28-2013, 03:21 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525475
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ Raditor fan relay woes

Welcome to the garage.
Not sure about the quality of the autozone relays, but many times the fan is the culprit. It still works, but will draw too much current, which finally fries the relay.
__________________

__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 08-28-2013, 03:34 PM
New Member
 
Join Date: Aug 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dustincstn82 is on a distinguished road
Thanks! When I started this process we replaced the fan along with the thermostat
__________________
Reply With Quote
  #4  
Old 08-28-2013, 03:42 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525475
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ Raditor fan relay woes

Did you check if it is not running all the time when the engine gets at operating temperature?
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #5  
Old 08-28-2013, 04:56 PM
New Member
 
Join Date: Aug 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dustincstn82 is on a distinguished road
Yes. It overheats rapidly because the fan doesn't turn on at all.
__________________
Reply With Quote
  #6  
Old 08-29-2013, 03:11 PM
2005JGC's Avatar
Senior Member


My Jeep: 2005 4.7L WK
 
Join Date: Nov 2010
Location: Portland, OR
Posts: 2,751
Thanks: 51
Thanked 69 Times in 58 Posts
Rep Power: 1652913
2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute2005JGC has a reputation beyond repute
Re: WJ Raditor fan relay woes

If you dont have any way of measuring the current the fan is drawing then I would replace BOTH the fan and the relay with new. If it works with a new relay it is a pretty good indication that the circuit is intact. As frank said, the fan will draw too much current and kill the relay. that is the ONLY draw on the circuit, so if it works with a new relay you know there is not a short and the wires start and end where they are supposed to, the only current decider is the fan.
__________________
2005 Jeep Grand Cherokee - Gone but not forgotten!

Reply With Quote
  #7  
Old 03-11-2014, 12:23 AM
Member
 
Join Date: Mar 2014
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 143
dino2004 is on a distinguished road
Hi i have a 2004 grand cherokee special edition it overheat at idle only . When driving its ok so wen i stop the car and look at fan its off i changed the temp control sensor next to tge thermostate but that was for the temp gauge inside is there another sensor somewhere else that might have gone bad that tells fan go go on ?
__________________
Reply With Quote
  #8  
Old 03-11-2014, 08:03 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525475
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ Raditor fan relay woes

Welcome to the garage.
You have the 4.0 engine? (4.7 has hydraulic fan setup, which always idles when engine runs)
Either way, there is only one engine coolant temp sensor. It gives the coolant temperature information to the PCM, which sends it to the instrument cluster for indication and uses the signal for several calculations for injection and spark, but also for the cooling fan off/on signal.
The 2004 model has two relays in the PDC (Power Distribution Center) under the hood; a low speed and a high speed relay. You could swap the low speed relay with a known good one. You can also put 12v directly on the fan motor, to check if it works ok. Many times the fan motor start drawing too much current and fries the relay (at least this happens a lot on the pre 2004 models with a PWM relay under the right headlight (As seen from drivers position))
Attached Files
File Type: pdf 2004 4.0 fan relays..pdf (168.6 KB, 3 views)
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #9  
Old 03-11-2014, 08:15 AM
Member
 
Join Date: Mar 2014
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 143
dino2004 is on a distinguished road
Ok thanks ill check it out
__________________
Reply With Quote
  #10  
Old 03-11-2014, 09:21 AM
DeucesALLin's Avatar
Member
 
Join Date: Oct 2013
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 306
DeucesALLin is on a distinguished road
Re: WJ Raditor fan relay woes

FWIW:

In my JK I decided to use a lifetime replacement fan from Advanced for $120 instead of the $200 OEM unit. I did however install a switch to kill it during crossings. Zero failures.

ALSO:
I know that JK's that went to Egypt had mechanical fans and alot of the JK crowd were switching to those with dealer parts. Since WJs went all over the world, has anyone researched if this is an option?
__________________
Green Mamba: WINCH TSOB: WINCH Brad's Sluice: WINCH
Turtle Hump/Limp Pine/Double Bead/Lone Rock:FWD&REV!
Driving 10 hours there and 16 back with DW: WINNING!
Reply With Quote
  #11  
Old 03-11-2014, 10:00 AM
Member
 
Join Date: Mar 2014
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 143
dino2004 is on a distinguished road
I only overheat when at ifle more than 7 minutes cause fan is not going on
__________________
Reply With Quote
  #12  
Old 03-11-2014, 10:27 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525475
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: WJ Raditor fan relay woes

If you want to check for voltage, i had added the wiring to my previous post.
__________________

__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
fan relay problems straty1987 Troubleshooting/Problems 1 05-10-2012 05:36 AM
fan relay CBeluga3 Troubleshooting/Problems 5 04-20-2012 01:13 PM
Fan Relay Problem BigTicket13 Engine Performance/Intake/Exhaust 7 12-03-2011 05:23 PM
Cooling Fan Relay uniquetreatone Troubleshooting/Problems 5 04-05-2011 10:08 AM
Fan relay Razoobadmash Troubleshooting/Problems 3 06-26-2010 08:54 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 05:29 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community