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#4452665 - 07/07/17 07:45 PM Jeep Cherokee XJ Running Hot
Nick1994 Offline


Registered: 02/19/13
Posts: 10104
Loc: Phoenix, AZ
My Cherokee has been running hot lately. I just put in a new OEM thermostat as a preventative measure and with this heat (118 today) it is running hot. I don't drive it often so I'm not sure if it is related to the new thermostat or not, it was getting a bit warm before but I haven't driven it in this kind of heat lately. Driving down the road it's usually at about 215, but once it does some idling and stop and go it goes up to about 230. No air bubbles in cooling system, we used a burping funnel. Over the last few years the entire cooling system has been replaced. Radiator, heater valve, all hoses, water pump, thermostat, Napa fan clutch (engages good). Electric fan now also has a manual fan switch and in this heat I leave it on.

My Jeep didn't originally come with a real thermometer on the dash, just a light up dummy light. My mechanic installed a real gauge and it's worked great, shows the actual temperature. Only issues I had in the summer was driving in the sand with higher RPMs.

I'm afraid to drive it much at 230 degrees for fear i could cause damage. Any other ideas?
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4452679 - 07/07/17 07:54 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Warstud Online   content


Registered: 09/02/05
Posts: 5395
Loc: MIchigan
I would check the fluid level in both the radiator and expansion tank.

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#4452688 - 07/07/17 07:58 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Nick1994 Offline


Registered: 02/19/13
Posts: 10104
Loc: Phoenix, AZ
I meant to say in the post above that the only issues were actually in the winter, when driving in the sand it got to 230.

Maybe I should put in a lower thermostat? Like 180 instead of 195? I'd like to not bandaid it though.

Radiator and overflow are full. Coolant is 50/50 mix
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4452722 - 07/07/17 08:24 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Syntheticuser Offline


Registered: 06/11/17
Posts: 147
Loc: Waco, Tx.
Nick, when did you last change the water pump? The impellers could be eroded. Fan clutch? Clean condenser and radiator.

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#4452735 - 07/07/17 08:34 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Those xj's always run hot! The radiator is undersized and barely adequate. Throw in a little corrosion and plugged tubes and they overheat.
The ones with a temperature gauge use a dummy gauge,if it showed actual temps all sorts of people would be scared.

What style of radiator is in it? Metal or plastic?
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#4452736 - 07/07/17 08:34 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Those xj's always run hot! The radiator is undersized and barely adequate. Throw in a little corrosion and plugged tubes and they overheat.
The ones with a temperature gauge use a dummy gauge,if it showed actual temps all sorts of people would be scared.

What style of radiator is in it? Metal or plastic?
_________________________
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#4452739 - 07/07/17 08:36 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Replacing the 195 stat with a 180 wont help. Once to those temps the stat is fully open anyway.
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#4452758 - 07/07/17 08:56 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Nick1994 Offline


Registered: 02/19/13
Posts: 10104
Loc: Phoenix, AZ
It's got the O'Reillys $109 radiator.

Everything is new in the cooling system.

I've hosed off the condenser before, A/C works perfect, blows ice cold even while running hot.

My mechanic has a customer also with a 96' Cherokee with the 4.0L, also has a newer radiator. It reads at 195 with the same aftermarket gauge hooked up to the same spot, he checked it 30 minutes ago on that Jeep.
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4452839 - 07/07/17 09:46 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Dyusik Offline


Registered: 09/26/14
Posts: 1981
Loc: US-WA
Buddy threw parts at his left and right until I donated my old clutch fan. His got hot in idling and low speed operation. I have a 4 cylinder fan, moves a LOT of air. Like 30 bucks at napa. AW4 produces quite a bit of heat, so additional cooling to it might be helpful.
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#4452840 - 07/07/17 09:47 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
How does the fin count look on your radiator?
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#4452847 - 07/07/17 09:53 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Kruse Offline


Registered: 10/05/05
Posts: 4295
Loc: Kansas
Originally Posted By: Nick1994
It's got the O'Reillys $109 radiator.


I've got two '96 Cherokees, both with the 4.0 engine. One has a manual transmission, the other is an automatic.
IMO, you need to stay away from the cheapie aftermarket radiators. As you have witnessed, these Jeeps run hot and the radiator is not only undersized, but it is so exaggeratedly rectangular that they used both a mechanical fan and an electric fan at the same time.
Also, you say everything is new, but is the fan shroud in perfect shape? I'd also suspect the fan clutch, even if it is new and appears to be working good. There are a lot of bad aftermarket fan clutches for the Jeep Cherokees.
Not to give them a free plug, but my Jeep with the manual transmission also has a radiator from this company: http://www.btr-radiator.com/ I've had it about three years and the temp dropped to a manageable level immediately after I installed it.
I have no problem running at 205 or below at all times.

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#4452853 - 07/07/17 09:59 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
MNgopher Offline


Registered: 09/17/02
Posts: 4042
Loc: Lakeville, MN
Chris is on the right track - the radiator in those was right on the edge of being able to handle the 4.0. One piece of the system is marginal and presto, problems.

Going to a lower temp thermostat will do nothing in those temps.

My issue was the fan clutch back when I had a Cherokee. I went through three bad ones right out of the box - Napa/Hayden units (at the time). Switched to a torqueflo from Autozone, and it worked much better. The cherokee often sounded like a Mack truck when the cooling fan engaged, but it definitely worked!

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#4452860 - 07/07/17 10:04 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Ya make sure that your shroud is all there. Often people break the bottom off it.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4452899 - 07/07/17 11:22 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
Nick1994 Offline


Registered: 02/19/13
Posts: 10104
Loc: Phoenix, AZ
When replacing the radiator a couple years ago the shroud broke and I put a new one in.

Fan clutch was an O'Reillys one and last year it wasn't engaging as much, I put in a Napa one and it moves a ton of air.

Catalytic converter has some dents on the bottom (it's a Jeep), mostly just the heat shield I think. It rattles but it's only the heat shield. Poking with a screwdriver makes it stop. Thinking of replacing the catalytic converter as well. Any way to diagnose if it's bad?
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4452923 - 07/07/17 11:44 PM Re: Jeep Cherokee XJ Running Hot [Re: Nick1994]
thescreensavers Offline


Registered: 12/21/09
Posts: 414
Loc: Jupiter, FL
Which radiator did you put in?

I have a spectra radiator which is 70$ https://www.amazon.com/Spectra-Premium-CU1193-Complete-Radiator/dp/B000C7S062

I also put in a 180deg thermostat, on the highway it's running ~190 in South Florida with AC on full blast, at lights and other times it will still sit at 210 but with earlier opening thermostat seems to help.



Edited by thescreensavers (07/07/17 11:45 PM)
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