cooling problem - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > cooling problem

GEARSHADE Pocket Tops in stock and available at ROCKRIDGE G2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ ChBill Baird Motorsports DIY parts - NalinMFG.com

Reply
Unread 07-23-2012, 04:21 PM   #1
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
cooling problem

ik the search does wonders but i cant seem to find an answer to this. i have a 96 xj and for some reason it runs about 210 give or take when driving say down a high way at 55, which seems to be ok to me. when in town going stop sign to stop sign, light to light, or not getting stuck at a light but just driving slow through town it like to go above the 210 and run between that and the line before the red zone on the guage. this also happens driving up large hills ( live in the poconos in Pa so up over the mountian to the next town). after getting back to high way speed it slowly goes back down or if i turn on the defroster i hear the fan kick on loudly and it slowly slowly goes back. i do hear the fan sometimes if im listening for it so it does come on by its self, the water pump and thermo stat are also newer. the wate pump went so it was replaced and i replaced the thermo stat to try and fix this issue and it has been happening for a long while now so any and all suggestions or other questions would help thanks

yeti92 is offline   Reply With Quote
Unread 07-23-2012, 06:35 PM   #2
tjwalker
It's the crank sensor!
 
tjwalker's Avatar
1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,408
The #1 cause of temperature creep at idle is a bad fan clutch. Often ignored, inexpensive and easy to replace.

If the temp is GOOD down the highway, I'd pop in a new fan clutch.
__________________
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
tjwalker is online now   Reply With Quote
Unread 07-23-2012, 07:55 PM   #3
Carves
Registered User
1998 XJ Cherokee 
 
Join Date: Oct 2008
Location: Western N.S.W., Australia
Posts: 1,032
X 2 on the fanclutch being the likely problem.
Carves is offline   Reply With Quote
Unread 07-23-2012, 08:46 PM   #4
david92xj
Registered User
1992 XJ Cherokee 
 
Join Date: Jul 2011
Location: Shelby Twp, MI
Posts: 770
x3 fan clutch
david92xj is offline   Reply With Quote
Unread 07-23-2012, 08:49 PM   #5
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
I have replaced the clutch fan once before from the junk yard man you could spin real easy the one I got pretty much stops after u stop pushing on it
yeti92 is offline   Reply With Quote
Unread 07-24-2012, 09:42 AM   #6
buildin1XJ
Web Wheeler
1999 XJ Cherokee 
 
Join Date: Oct 2011
Location: Knoxville, Tn.
Posts: 1,568
Heat creep at Idle almost allways is a bad fan Clutch
buildin1XJ is offline   Reply With Quote
Unread 07-24-2012, 06:11 PM   #7
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
Is there a way to determine its bad other than being easy to spin
yeti92 is offline   Reply With Quote
Unread 07-24-2012, 07:29 PM   #8
donthelegend
Registered User
1999 XJ Cherokee 
 
Join Date: Apr 2010
Location: STL, MO
Posts: 931
Quote:
Originally Posted by yeti92 View Post
Is there a way to determine its bad other than being easy to spin
No, and even that is not a definitive test. (Well technically I guess you could measure CFM across the radiator at different temperatures, but most people don't have access to that kind of equipment) Fan clutches are a wear item and if you are unsure of its condition and its more than a few years old, replace it. Additionally, your symptoms point directly to the fan clutch as the #1 culprit.
donthelegend is offline   Reply With Quote
Unread 07-24-2012, 11:34 PM   #9
Carves
Registered User
1998 XJ Cherokee 
 
Join Date: Oct 2008
Location: Western N.S.W., Australia
Posts: 1,032
Quote:
Originally Posted by yeti92 View Post
Is there a way to determine its bad other than being easy to spin

In the chrysler service manual theres a process using using a thermal probe, a timing light and sheets of plastic in front of the radiator ... but even that doesnt confirm the CFM rate - just the engager/disengage times according to the air temp behind the radiator.

The spin test, is at best ... indicative only.
Just because it feels locked up - doesnt mean its locked up as much as it should be.

as a general rule of thumb ... throw it away and replace at about 80k miles .... keeping in mind that some last longer and others fail sooner.

Its also a good idea to start out with a new one ... on a new to you vehicle ... as gawd knows what junkyard rubbish someone may have fitted before you bought it.
Carves is offline   Reply With Quote
Unread 07-25-2012, 06:49 PM   #10
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
Well I guess il try a new one and get back to yous but say that doesn't work what's next on the list thanks
yeti92 is offline   Reply With Quote
Unread 07-25-2012, 11:21 PM   #11
ltrail
Registered User
1984 XJ Cherokee 
 
Join Date: Sep 2010
Location: mesa, AZ
Posts: 1,461
Flush cooling system lately? Did the water pump I see but how long ago? Was the system filled wirh the correct mix and properly bled?
__________________
84 xj 350tbi, sm465, 203/205, 60/70. links and other junk.
what size sawzall blades does it take to fit 40's?
ltrail is offline   Reply With Quote
Unread 07-25-2012, 11:30 PM   #12
Reptile
Web Wheeler
1991 XJ Cherokee 
 
Join Date: Feb 2011
Location: Bakersfield, CA
Posts: 1,297
Quote:
Originally Posted by yeti92 View Post
Well I guess il try a new one and get back to yous but say that doesn't work what's next on the list thanks
Fan clutch seems the most likely, but if this doesn't work then next on the list would possible rad leak (are loosing coolant over time?) or bad rad cap.
Reptile is offline   Reply With Quote
Unread 07-27-2012, 08:00 PM   #13
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
Well bought the clutch for the fan hopefully putting it in tomorrow
yeti92 is offline   Reply With Quote
Unread 07-30-2012, 03:14 PM   #14
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
Well fans in and it seems to have no to little effect on my temp seems like it took a little longer to go over but its been a tad cooler and raining and not 90 degrees out so any other thoughts
yeti92 is offline   Reply With Quote
Unread 07-31-2012, 06:35 PM   #15
yeti92
Registered User
1996 XJ Cherokee 
 
Join Date: Mar 2010
Location: United States, Pa
Posts: 106
Anybody
yeti92 is offline   Reply With Quote
Reply

Tags
coolant , cooling , issue , over heating , temp
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.