99 WJ runs hot - JeepForum.com
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 > WJ Grand Cherokee Forum > 99 WJ runs hot

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineNew jk doors from steinjagerEliminate Hood Flutter!!!

Unread 05-04-2013, 12:17 AM   #1
Registered User
2000 WJ 
Join Date: Aug 2012
Location: longmont, Colorado
Posts: 62
Wj 99 WJ runs hot

Hey my 99WJ ltd I6 4.0 178k runs at about 210 unless im in traffic or a drive thru then it jumps up. Ive been told my Fan relay is dead and the fan itself im wondering looking on line what all Id need for this. I see the radiator fan assembly but does that come with the motor? and do i need the motor? the tech tried to go past the relay and jump the fan it didnt spin so i assume that means i need the motor. he tried the relay and it was dead too but thats EZ just cut the hole under the headlight.

so just a little clarification is needed or maybe a link to the part

Bigwheelz is offline   Reply With Quote
Unread 05-04-2013, 04:44 AM   #2
Registered User
2000 WJ 
Join Date: Feb 2013
Location: allentown, pa
Posts: 25
My 2000 had the same problem. I was lucky and only had to replace the sensor an relay. I'm pretty sure you can get an aftermarket fan from pep boys for under $100
Vejito is offline   Reply With Quote
Unread 05-04-2013, 05:46 AM   #3
Registered User
1999 WJ 
Join Date: Jan 2013
Location: Minot, ND
Posts: 244
New fan cost me 150 with the motor included
Highschool_WJ is offline   Reply With Quote
Unread 05-04-2013, 08:33 AM   #4
Senior Member
doityourselfMM's Avatar
1999 WJ 
Join Date: Dec 2010
Location: manassas, va
Posts: 779
I'd try to check each individual component before I 'shotgunned' the problem, replaced things that might not be broken, and spent more than needed. The relay in your '99 is solid state. It switches on and off very quickly to control the fan rpms. If you have a VOM, you could unplug the fan, and check for an open circuit, which would definately indicate the fan has taken a crap. You might be able to check your coolant temp switch the same way, although I think the impedence varies with temperature. But once again, an 'open' means defective.

All that's to the best of my aging recollection.
doityourselfMM is offline   Reply With Quote
Unread 05-04-2013, 05:07 PM   #5
Registered User
1999 WJ 
Join Date: Aug 2012
Location: Fort McMurray, Alberta
Posts: 67
Today my 99 WJ 4.0 ran very hot while waiting at a drive trough. The check gauges light came on and the coolant temp gauge was approaching red line.
Drove it home which was only 1km and the temp light started to go down. I opened the hood and now the coolant level is about 2 inches above full level. On previous days the level when temp was in normal operating range was just under full mark maybe half an inch.
Obviously the fan is not working but is it normal for the coolant to rise that much if the coolant is becoming very hot?

I absolutely need my car on Tuesday night to drive for 500 km. If I can't fix the fan, is it ok to drive with a non working fan? I'll be driving at night and it is all the way Highway with no stop and go traffic.
as350b3e is offline   Reply With Quote
Unread 05-06-2013, 09:41 PM   #6
Registered User
2000 WJ 
Join Date: Aug 2012
Location: longmont, Colorado
Posts: 62
as350b3e--yeah you can drive with out the fan they used to make cars that were cooled by the air from driving. or so my WJ has been OK so far and its been hot for a while now just try to stay moving and don't strain the engine to much (mtn driving or traffic) if your going along at lower speeds you can pop the latch on the hood( keep it latched but just pop the hood) and it will help drastically keep it cool just don't go fast! and the coolant drains from the radiator or something along those lines so that's were that excess fluid came from at least it wasn't boiling!

and we checked the relay and motor both were bad found at napa for $138 for the fan assembly w/motor and 50 for the relay with a 36k mile warranty for 50$ now just gotta pick them up and do the work lol

Thanks for yalls help truly appreciate it!
Bigwheelz is offline   Reply With Quote
Unread 05-06-2013, 10:53 PM   #7
Registered User
2004 WJ 
Join Date: Feb 2012
Location: San Rafael, Ca
Posts: 2,303
MuddyWJ is online now   Reply With Quote

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.