Maryland Cherokee Club
Senior Member
Joined: Dec 2011
Posts: 675
Likes: 0
From: kingsville
Year: 91
Model: Cherokee
Engine: 4.?
Just picked up the new xj (99 classic)(yes another 1) only issue it is having is its running alil hot at 220 and the aux fan will kick on and not turn off,& at times the gauge pings right to 250 for a min but isnt overheating then goes back down to 220.replaced the waterpump, thermostat, flushed the system, new temp sending unit,

put a zj fan clutch on and no difference.any ideas

put a zj fan clutch on and no difference.any ideas
CF Veteran
Joined: Dec 2011
Posts: 4,006
Likes: 1
From: Pasadena, MD
Year: 1987
Model: Wagoneer
Engine: Renix 4.0
Just picked up the new xj (99 classic)(yes another 1) only issue it is having is its running alil hot at 220 and the aux fan will kick on and not turn off,& at times the gauge pings right to 250 for a min but isnt overheating then goes back down to 220.replaced the waterpump, thermostat, flushed the system, new temp sending unit,
Attachment 130431
put a zj fan clutch on and no difference.any ideas
Attachment 130431
put a zj fan clutch on and no difference.any ideas
CF Veteran
Joined: Jan 2012
Posts: 8,272
Likes: 1
From: Baltimore, MD
Year: 1999
Model: Cherokee
Engine: 4.0 I6 HO
Originally Posted by xjclassicxj
Just picked up the new xj (99 classic)(yes another 1) only issue it is having is its running alil hot at 220 and the aux fan will kick on and not turn off,& at times the gauge pings right to 250 for a min but isnt overheating then goes back down to 220.replaced the waterpump, thermostat, flushed the system, new temp sending unit,
put a zj fan clutch on and no difference.any ideas
put a zj fan clutch on and no difference.any ideas
CF Veteran
Joined: Feb 2012
Posts: 1,036
Likes: 0
From: Mt Airy, MD
Year: 1997/2000
Model: Cherokee
Engine: both 4.0's
Just picked up the new xj (99 classic)(yes another 1) only issue it is having is its running alil hot at 220 and the aux fan will kick on and not turn off,& at times the gauge pings right to 250 for a min but isnt overheating then goes back down to 220.replaced the waterpump, thermostat, flushed the system, new temp sending unit,
Attachment 130431
put a zj fan clutch on and no difference.any ideas
Attachment 130431
put a zj fan clutch on and no difference.any ideas
Morning All, from the Republic of Texas....
Senior Member
Joined: Dec 2011
Posts: 675
Likes: 0
From: kingsville
Year: 91
Model: Cherokee
Engine: 4.?
Originally Posted by a_shirey
damn dude, another one? lmao. i think youre beating frosty now. and maybe your gauge is bad or the fan clutch is messed up.
Senior Member
Joined: Dec 2011
Posts: 675
Likes: 0
From: kingsville
Year: 91
Model: Cherokee
Engine: 4.?
Originally Posted by yellaklein
I was going thru the same awhile back. even took a few theromstats and boil tested them for when they closed. Mine ended up being a clogged up OEM Radiator, seems somewhere down the line of PO's someone had put in radiator sealer. I had chunks in my overflow bottle, and when I was taking out the old Radiator it wouldn't flow worth a damn. So I upgraded radiator to a 3 core and stays nice and cool.
Morning All, from the Republic of Texas....

CF Veteran
Joined: Feb 2012
Posts: 1,036
Likes: 0
From: Mt Airy, MD
Year: 1997/2000
Model: Cherokee
Engine: both 4.0's

And yes XJ's are like Jeep Crack.
Hells no..
Last edited by yellaklein; Jul 14, 2012 at 08:57 AM.





