WJ Overheating in Traffic - 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 Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > WJ Overheating in Traffic

ZONE 4.25" combo lift for TJ available at Rockridge4wJeep Wrangler Bushwacker Flat Fender Flare Sale at BaselinRIGID LED Light Blowout Sale - All Sizes, All Series, all

Reply
Unread 07-19-2007, 06:25 PM   #1
safarimike
Registered User
1999 TJ Wrangler 
 
Join Date: Mar 2005
Location: Marlton
Posts: 660
WJ Overheating in Traffic

My brothers Jeep - 2001 WJ 4.0

Says it overheats in traffic, highway driving its fine. Started it up tonight, let it idle in park with a/c on. Gets to to 210, climbs pretty quick (less than 5 minutes) to just under 260, which is when I turned it off. Letting it run I kept checking the cooling fan, fan never came on. So, I guess thats the problem, anybody have any ideas why its not?

I tried to find a fuse for it, but its a weird looking thing, doesn't look like a normal fuse or relay. Its a 40 amp, and there are other 40 amps under there, so I am going to swap one of em and see what happens once engine cools down.

__________________
1999 Jeep Wrangler Sport
safarimike is offline   Reply With Quote Quick reply to this message
Unread 07-19-2007, 06:27 PM   #2
djdoug99
Member
 
Join Date: Feb 2007
Location: SF Bay Area, California
Posts: 202
I think the fan relay is a common fix to the fan not turning on problem. The relay is under the right headlight, or left. I forget.
djdoug99 is offline   Reply With Quote Quick reply to this message
Unread 07-19-2007, 06:44 PM   #3
Redbob
Registered User
2004 WJ 
 
Join Date: Jul 2006
Location: North Texas
Posts: 1,062
A quick check is to turn on the air conditioning; if the fan doesn't come on in less than a minute, there's a fan problem.
Redbob is offline   Reply With Quote Quick reply to this message
Unread 07-19-2007, 06:46 PM   #4
djdoug99
Member
 
Join Date: Feb 2007
Location: SF Bay Area, California
Posts: 202
Here is a link that may be helpful. Scroll down to the fan relay portion

http://rigs.corequipment.com/cebby_W...ooling.htm#top
djdoug99 is offline   Reply With Quote Quick reply to this message
Unread 07-19-2007, 06:51 PM   #5
safarimike
Registered User
1999 TJ Wrangler 
 
Join Date: Mar 2005
Location: Marlton
Posts: 660
Swapped the blower motor fuse (although it doesn't look like a fuse) for the 4.0 cooling fan fuse. With cooling fan fuse in blower motor fuse, blower motor still worked. Checked connection, its plugged in, appears to be no signs of wire damage from what I can tell. Check engine light is on now.

I guess the best bet would be to get a test light on the connector and see if the fan is getting the supplied power and ground.
__________________
1999 Jeep Wrangler Sport
safarimike is offline   Reply With Quote Quick reply to this message
Unread 07-19-2007, 06:54 PM   #6
djdoug99
Member
 
Join Date: Feb 2007
Location: SF Bay Area, California
Posts: 202
get the codes and use a 12V source for the fan.
djdoug99 is offline   Reply With Quote Quick reply to this message
Unread 07-20-2007, 07:54 PM   #7
safarimike
Registered User
1999 TJ Wrangler 
 
Join Date: Mar 2005
Location: Marlton
Posts: 660
I didn't get a chance to work on it today, but I am gonna try to swap relays and see if thats the cause. Can I just swap relays with one of the ones up top in the electrical box?
__________________
1999 Jeep Wrangler Sport
safarimike is offline   Reply With Quote Quick reply to this message
Unread 07-20-2007, 07:58 PM   #8
safarimike
Registered User
1999 TJ Wrangler 
 
Join Date: Mar 2005
Location: Marlton
Posts: 660
just read about cutting the access hole for the relay, I will go with the test light idea first before i start taking stuff apart.
__________________
1999 Jeep Wrangler Sport
safarimike is offline   Reply With Quote Quick reply to this message
Unread 07-20-2007, 08:59 PM   #9
Dodge,Jeep Tech
Registered User
 
Join Date: Mar 2007
Location: Atlanta, GA
Posts: 85
wow this is fun hehe seeing all the different things people say and do.
__________________
[SIZE="3"]Dealer trained Tech 15 years Now Proud Owner operator Kevin's Mobile Repair in ATLANTA. Repairing Chrysler,Dodge and Jeep
[EMAIL="KKeller608@aol.com"]KKeller608@aol.com[/EMAIL]
[URL]http://kevinsmobilerepair.com[/URL][/SIZE]
Dodge,Jeep Tech is offline   Reply With Quote Quick reply to this message
Unread 07-20-2007, 10:25 PM   #10
skain8
Under Construction
 
skain8's Avatar
2002 WJ 
 
Join Date: Oct 2004
Location: Reading, PA
Posts: 3,640
Quote:
Originally Posted by Dodge,Jeep Tech
wow this is fun hehe seeing all the different things people say and do.
well, what's your suggestion?
__________________
Tom

'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
'99 XJ: stock
'99 XJ: stolen
'06 XK: sold
231HD build guide
skain8 is offline   Reply With Quote Quick reply to this message
Unread 07-22-2007, 03:47 PM   #11
safarimike
Registered User
1999 TJ Wrangler 
 
Join Date: Mar 2005
Location: Marlton
Posts: 660
put a test light on the connector. looks like a constant ground at the connector, and the fan is supplied a power. with a/c on, let it run up above 210,but below 260, never got one power signal from the wire. so i am guessing its the relay?
__________________
1999 Jeep Wrangler Sport
safarimike is offline   Reply With Quote Quick reply to this message
Unread 07-22-2007, 04:00 PM   #12
lma1973
Registered User
 
Join Date: Apr 2004
Location: Raleigh, NC
Posts: 1,033
260 is way too high...never let it get that hot-turn it off first if you have to!!!
__________________
1994 Grand Cherokee Limited 4x4 5.2 V8
lma1973 is offline   Reply With Quote Quick reply to this message
Unread 07-22-2007, 09:35 PM   #13
simidrm
Registered User
 
Join Date: Jun 2007
Location: ohio
Posts: 27
use a jumper wire to test fan if it works then the problem is the fan relay its locate behind the head light on the passenger side frame.

you have to pull both headlights grill-front bumper cover and plastic grill support.
About a 3hr job most shops charge 180-200 to fix relay was 60.00 at autozone
simidrm is offline   Reply With Quote Quick reply to this message
Unread 07-22-2007, 09:59 PM   #14
Cebby
Registered User
2000 WJ 
 
Join Date: Feb 2007
Location: Pittsburgh (Oakmont), PA
Posts: 553
Quote:
Originally Posted by simidrm
you have to pull both headlights grill-front bumper cover and plastic grill support.
About a 3hr job most shops charge 180-200 to fix relay was 60.00 at autozone
Quote:
Originally Posted by djdoug99
Here is a link that may be helpful. Scroll down to the fan relay portion

http://rigs.corequipment.com/cebby_W...ooling.htm#top
Or cut the hole like in my writeup and future changes take 5 minutes. I'm on my 4th fan relay. BTW, my "5-Star" dealer charged me 3 hours of labor to cut the hole beneath my headlamp. I discovered this when the relay they installed died.

BTW, testing the fan is a good first step - the connector to it is on the side of the shroud - it uses one of those red clips to keep it together. Polarity doesn't matter for testing - it should fire right up when put to 12 volts.
__________________
Tech Writeups and more...
2000 WJ Laredo 4.0 4x4 Taupe Frost - Clayton LA Front/Rear | IRO 3" Springs + 3/4" KOR | Bilstein Shocks | JKS Discos/Trackbar/Draglink & Tierod | Dual KOR Stabs | Spidertrax Spacers | 265/70R17 Duratrac's on JK 17's | Black Magic Brakes w/Centric Rotors | Akebono Calipers | Griffin Rad | K&N Drop in | Magnaflow Cat & Muffler shorty setup | Diehard Platinum (Odyssey) | RB1-NAV-Sirius-Chg-iPod | OEM Tow Hooks F/R
Cebby is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


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.