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XJ Ask the Question Thread
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Sorry to thread jack, but on topic of overheating.
1990 xj 4.0 (W/ open cooling system swap.)
New 195 tstat
New 3 row rad
New waterpump
New hoses
A/c and heater core deleted
New zj clutch fan
Rear of hood raised 1" for cooling
New 16lb cap
Ac condenser removed, (nothing blocking rad)
Electric fan on toggle switch.
Like the previous OP, mine runs fine every season but summer. Az temps from 90-115*f. It can run find on some days and others it can get to 210 and then slowly creep to about 220-230 but even with the electric fan on i cant get the temp down. At stop lights it creeps during those times also.
1990 xj 4.0 (W/ open cooling system swap.)
New 195 tstat
New 3 row rad
New waterpump
New hoses
A/c and heater core deleted
New zj clutch fan
Rear of hood raised 1" for cooling
New 16lb cap
Ac condenser removed, (nothing blocking rad)
Electric fan on toggle switch.
Like the previous OP, mine runs fine every season but summer. Az temps from 90-115*f. It can run find on some days and others it can get to 210 and then slowly creep to about 220-230 but even with the electric fan on i cant get the temp down. At stop lights it creeps during those times also.
CF Veteran
Joined: May 2011
Posts: 1,458
Likes: 2
From: Glendale,Az
Year: 1990
Model: Cherokee
Engine: 4.0l 6Cyl
I believe everything being brand new should be what keeps the temps lower. I cant figure out why once i get above 210 it wont cool itself down.
I have bo problem getting to operating temp but on hot days it goes past and doesnt cool itself down. Its starting to do it and its only 90* here, i know in 2 months when its above 110* it will be doing it even worse.
Junior Member
Joined: Mar 2011
Posts: 84
Likes: 0
Model: Cherokee
Maybe a stupid question.. But I noticed I don't have a fan shroud... How detrimental is that? Could that be most of the cause?
Newbie
Joined: Apr 2013
Posts: 9
Likes: 0
From: San Diego, CA
Model: Cherokee
Can be a big part of it. At speed air is passing the rad. In "drive thru" mode, air is just moving around the fan and not much is pulling through the rad. I imagine you will see an improvement for sure with a shroud!
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Junior Member
Joined: Mar 2011
Posts: 84
Likes: 0
Model: Cherokee
Now I can't even go 2-3 miles WO it over heating... Stuck on Heubner off ramp :/ She's making me mad........
CF Veteran
Joined: May 2012
Posts: 3,242
Likes: 2
From: Colorado
Year: 1992 Cherokee Sport
Engine: Bone-Stock 242
Seasoned Member
Joined: Jan 2013
Posts: 298
Likes: 0
From: Pinehurst
Year: 2000
Model: Cherokee
Engine: H.O. 4.0L I6
Been reading about the 0331 head problem now im all paranoid that it might b happening to my '00 what with the injector issue and I had to add almost a whole gal of coolant today didnt check the oil tho...im at 70 something k now doubt its warrantied either
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Newbie
Joined: Oct 2012
Posts: 3
Likes: 0
Model: Cherokee
I don't know if that last post went through.. Sorry if this is a copy... I over heated 3 times today.. Last time it dumped all my coolant. And ran like crap till I poured more in. It actually scared me cause I thought I blew the head. But the oil still looks good. Today was the first actual hot day so I know its gonna happen again. Normally yes, it stays around 200 210.. But can I get it so it stays under 200?
Junior Member
Joined: Mar 2011
Posts: 84
Likes: 0
Model: Cherokee
CF Veteran
Joined: Dec 2010
Posts: 1,240
Likes: 0
From: Rocket Country MI
Year: 1999
Model: Cherokee
Engine: 4.0
I'm about to pull my front axle to do all the bearings, any pointers to keep this from being a major p.i.t.a.? I have about a week it can be down so I'm not gonna rush it.
Senior Member
Joined: Nov 2012
Posts: 521
Likes: 0
From: Oregon
Year: 1996
Model: Cherokee
Engine: 4.0
My 96 isnt having the electric fan kick on. I was overheating alot at the gas station and in traffic and then at home i watched my temp gauge climb and the fan never came on. Is there a waybto figure out whats wrong? Its worked before which is odd, its like it got too hot and it decided to not work.
Also, whats the temp that he stock tstat comes on? I want to get a new thermostat just for peace of mind and to help cool it.
Also, whats the temp that he stock tstat comes on? I want to get a new thermostat just for peace of mind and to help cool it.
CF Veteran
Joined: Nov 2010
Posts: 15,581
Likes: 8
From: some small town oregon
Year: 1989
Model: Cherokee
Engine: 4.0
My 96 isnt having the electric fan kick on. I was overheating alot at the gas station and in traffic and then at home i watched my temp gauge climb and the fan never came on. Is there a waybto figure out whats wrong? Its worked before which is odd, its like it got too hot and it decided to not work.
Also, whats the temp that he stock tstat comes on? I want to get a new thermostat just for peace of mind and to help cool it.
Also, whats the temp that he stock tstat comes on? I want to get a new thermostat just for peace of mind and to help cool it.
As for the fan its either goi g to ne the fan went bad. The switch went bad or the relay went bad. Start testing.