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Old 05-21-2013, 11:24 AM   #1
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Join Date: Jun 2012
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Cooling system behavior -- opinions needed

My Jeep: 2012 JKU; 3.73LS; 6 speed; 17000 miles

I was climbing a 5-8 degree rutted up road the other day in 4-low at about 5 mph/2500 rpm with the AC on (took 20 minutes to get to the top). It was a 90 degree day and I noticed an odd cooling system behavior I have not seen before.

I have never noticed the Jeep get above halfway on the temp. gauge, it has always sat just below half way. This day it actually climbed a couple of ticks (~20 degrees I am guessing) above halfway temporarily. After about a minute the Jeep cooled itself down to normal temps again (I did not stop driving). Then a few minutes later the Jeep climbed back up above halfway on the temp gauge and cooled itself off again.

My theory: The Jeep kicked on the electric fan to deal with the heavy workload and cool off the engine.

My question: Have any of you experienced something similar with the Pentastar engine? I am trying to confirm that it is normal behavior.

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Old 05-21-2013, 02:24 PM   #2
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I have this happen all the time in bad traffic in the summer. It's been like that since day 1 for me. Kind of hangs out up there just a little over half. As soon as traffic clears and I get moving, it's back to a hair under half again.

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Old 05-21-2013, 04:21 PM   #3
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I never run the ac offroad but in 4lo last weekend doing lots of climbing and just generally crawling along the fan did have to come on lots of times to cool things down and even smelt coolant a few times since I was running bare bones with no doors and no top. So I guess this is normal behavior for this thing.
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Old 05-21-2013, 06:27 PM   #4
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Location: In The Hot South West AZ, and cold Alaska
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Normal. Just the fan cycling on and off to make up for the lack of frontal CFM when moving down the highway at higher speeds!
Just make sure that you keep your radiator fins washed out free from obstructions, bugs, mud, leaves, etc.
I don't normally run my a/c off road, because it just adds additional heat to the engines cooling system!

One question, what is a couple of ticks?
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Old 05-21-2013, 08:13 PM   #5
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Last summer I experienced the same thing driving 4 miles up a mountain in 4lo at roughly the same rpms you were running. I didn't have the AC on though.

I think its normal.
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