Zj 5.9 Operating Temperature Range - JeepForum.com
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post #1 of 11 Old 07-07-2020, 12:45 AM Thread Starter
omerozturk
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Zj 5.9 Operating Temperature Range

Dear All,
I am a 5.9 owner from Turkey. In two weeks, I will start to a journey to South part of the Turkey. In order to understand general structure of the cooling system, I would like to learn about your comments and defined optimal working temperature for the vehicle.
Regards

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post #2 of 11 Old 07-07-2020, 01:41 AM
Zilliver
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Do you have any problems with the temp?

If the needle is in the middle part, you are all good.

98 Grand Cherokee 5.9 - daily
95 Grand Cherokee 5.2 - offroad
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post #3 of 11 Old 07-07-2020, 02:54 AM
Timo_90xj
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95C-105C is normal, in extreme cold it might drop slightly lower and creeps higher in heavy use. I do not feel comfortamble seeing engine temps above ~105C (220F) for extended period of time.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #4 of 11 Old 07-07-2020, 04:44 AM
V8GCZJ
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Quote:
I do not feel comfortamble seeing engine temps above ~105C (220F) for extended period of time.

That's why i run a 180 t stat. 195 is stock.
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post #5 of 11 Old 07-07-2020, 05:36 AM Thread Starter
omerozturk
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Quote:
Originally Posted by Zilliver View Post
Do you have any problems with the temp?

If the needle is in the middle part, you are all good.
Quote:
Originally Posted by Timo_90xj View Post
95C-105C is normal, in extreme cold it might drop slightly lower and creeps higher in heavy use. I do not feel comfortamble seeing engine temps above ~105C (220F) for extended period of time.
Till now, I did not feel any problem at all. During hot summer days with AC on, while climbing ramps, needle slightly passes 100deg C but not touches to 105 deg C Line.
Before my trip, I just wanted to be sure about my cooling system.
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post #6 of 11 Old 07-07-2020, 05:55 AM
Timo_90xj
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That sounds absolutely normal. However, I suggest installing an external auxiliary transmission cooler, and if you rarely see well- below freezing temps in your area bypass the radiator loop in the transmission cooler circuit.

When I swapped my original radiator to an all-aluminum 2-row unit and installed an external auxiliary transmission cooler, I saw a drop in average engine temp from 102-103C to a rock-steady 95C under most circumstances.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #7 of 11 Old 07-07-2020, 06:00 AM Thread Starter
omerozturk
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Quote:
Originally Posted by Timo_90xj View Post
That sounds absolutely normal. However, I suggest installing an external auxiliary transmission cooler, and if you rarely see well- below freezing temps in your area bypass the radiator loop in the transmission cooler circuit.

When I swapped my original radiator to an all-aluminum 2-row unit and installed an external auxiliary transmission cooler, I saw a drop in average engine temp from 102-103C to a rock-steady 95C under most circumstances.
Thanks for the comments and the suggestion. I will make a quick search for the external auxiliary transmission cooler. Do you have any brand that fits perfectly?

98 Grand Cherokee 5.9 Limited LX - daily
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post #8 of 11 Old 07-07-2020, 07:34 AM
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Quote:
Originally Posted by omerozturk View Post
Thanks for the comments and the suggestion. I will make a quick search for the external auxiliary transmission cooler. Do you have any brand that fits perfectly?
The biggest one you can make fit is your best choice.

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post #9 of 11 Old 07-07-2020, 09:24 AM
Timo_90xj
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I bought a Derale 9000- series 9-row plate & fin cooler. It is enough for my climate here in Finland (temps between May-Septmeber very rarely exceed 30C, most of the summer it is between 15-25C). Buy larger for warmer climate.
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1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #10 of 11 Old 07-07-2020, 12:11 PM
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Quote:
Originally Posted by V8GCZJ View Post
That's why i run a 180 t stat. 195 is stock.
Right...
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post #11 of 11 Old 07-07-2020, 11:47 PM Thread Starter
omerozturk
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Quote:
Originally Posted by Timo_90xj View Post
I bought a Derale 9000- series 9-row plate & fin cooler. It is enough for my climate here in Finland (temps between May-Septmeber very rarely exceed 30C, most of the summer it is between 15-25C). Buy larger for warmer climate.
I see, In here situation is harder Generally 30 - 35 deg C. Additionally, each year I visit south or west part of the county which is hotter than my city. I will search for bigger one

98 Grand Cherokee 5.9 Limited LX - daily
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