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Old 05-27-2016, 09:01 AM
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How often do you get above 230?

Hey everyone,

I've noticed that my that my coolant temp has a tendency to rise above the halfway mark to about the three-quarter mark on hills and drives about 80F. So, yesterday I took my OBDII scanner and logged a drive and noticed that the temp was 235F at the three-quarter mark. The fan kicked on hard and the temp fell within a minute or so, which seems to be fine.

However, I'm just curious how often this happens to other people. If I head out at high noon on a hot day, I can expect it to happen 2-3 times on a 25 minute drive in the area (hilly).

I now run 35s on 3" of lift, but this was happening prior to a tire change. Maybe a bit less so when I was running 32s, but I still noticed it occasionally.

Thanks!

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Old 05-27-2016, 09:29 AM   #2
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I hit 230 almost every time it gets driven. I just put on a vented hood to see if it helps at all. But I think it will just be good at making s'mores after I turn it off. The couple of trips I made didn't seem to help. But I can't wait for the winter now... It will steam out the vents and will be totally cool.

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Old 05-27-2016, 09:51 AM   #3
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I have the same issue. The trail dash has seen as high as 250, at which point the ecu dialed back the power. The weird thing is the temp gauge hardly moved off of center. Replaced the factory radiator with a Mishimoto one. Also had a flush done. How have added two hood vents. Lots of heat come out of those. Will have yo see what the temp dies now. Have not seen anything above 230 since all of the install.
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Old 05-31-2016, 08:13 AM
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Thanks for the replies guys, happy to know it isn't just me. Bump for any more experiences?

Also, drove one highway route over the weekend midday (90) and had this overheating issue come up. Drove it again this morning (70) and the gauge didn't move. Maybe I'm just being oversensitive to it...
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Old 05-31-2016, 11:11 AM   #5
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Happens to me every time on the way up the hill to my house. I have "35's", 3.5" of lift, and a 10K winch in front of my grill. My Jeep dealer says it is to be expected.
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Old 05-31-2016, 11:42 AM   #6
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I hit about 226F the other day in heavy traffic on a 90F day, I wasn't happy. I realize these engines run hot, and that is considered normal, but I can't help but think the heat is playing into the cylinder head problem some members experienced.

What really surprised me was the transmission fluid never went over 170F. I've seen it as high as 180F briefly in less traffic on a much cooler day.
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Old 05-31-2016, 12:26 PM   #7
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Yes these engines are designed to run higher temps, so that the factory can meet the Federal Mandate EPA requirements.

It seems that from 2014 on up, they are running higher temps. My 2013 seen a ambient temp here in Phoenix of 121 last Summer. With the A/C on and in traffic, my needle only went about a needle width past the middle mark. As soon as I got out of traffic, it settled right back to center.
On these hot days, I have measured my cooling temp with a Infra Red Heat Gun pointed at the top tank. I have never seen anything above 214. That was with the A/C on so the cooling fan was running.

Every year I pull my overflow bottle and flush it out, along with the hose to the cap. I also replace my radiator cap with a new MOPAR cap.
Equally as important is to keep your Radiator flushed out externally. I do this monthly and wash out the bugs and dirt. If you don't keep it clean externally, then it will run hotter.

Our forecast for this Saturday is 117..
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Old 05-31-2016, 02:41 PM   #8
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Is not overheating, that's is what Jeep like to run this puppies at, the fan doesn't come on until your coolant reaches 221F, and that's the low speed portion of it, using PWM, they'll ramp the speed up to Hi, depending on coolant, outside temp and trans fluid temp, hills make this worst, you can leave it alone knowing at least they designed all the parts to withstand the heat , or you can help the cause, by either putting an extra fan with manual switch, or you can tune the fan, I think Superchips can tune it, i do my own tuning so i can show you what it is

For instance, in my 2013, this is the factory approach, and what you do to tune it, your low fan comes it at 221F on a normal day where the outside temp doesn't exceeds 105F, above that, low fan comes in 217F.
Then Hi fan kicks in at 230F, and it's PWM, so the fan, even at high speed, might take a while to cool down the coolant, while the fan speed ramps up, going uphills would make things interesting for the fan, i saw temps close to 240F before on long steep hills,

Factory 2013 FAN strategy
2013_Jeep_Factory_Fan_strategy by Wrangler RSM, on Flickr

And this is how mine runs now, i'm telling the lo fan to come on at 210F, and by 212F the Hi speed activates, max i've seeing on the same hills is 216F, trans fluid runs cooler just because the fan are coming earlier, win-win.

2013_moded_fan by Wrangler RSM, on Flickr
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Old 05-31-2016, 03:03 PM   #9
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^^ I like what you did. I looked at Flashpaq I'm not seeing where you can program the fans to come on sooner as one of its features.
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Old 05-31-2016, 03:22 PM
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Thanks for all the help guys, I definitely need to take the time to clean my radiator/fan out good soon and then see how it goes. I know it's not overheating necessarily, but I asked because I've noticed my needle moving off 1/2 more often than previously.
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Old 05-31-2016, 03:48 PM   #11
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^^ I like what you did. I looked at Flashpaq I'm not seeing where you can program the fans to come on sooner as one of its features.
Maybe something that they don't allow you to adjust on your own ? i thought they did, but double checking right now with their website, it doesn't seem to be an option with Superchips , DiabloSports allows you to change this with their Intune/Trinity handhelds.

Can you log coolant temp with it ? You could check to see what you're ECT is doing, If so, check your coolant temp and correlate that with you fan engaged, typically the fan turns on 3-5F above the commanded temp, so in reality when you can hear the first stage of the fan, (i think you'll need to pop your hood to listen or watch the fan turn on), your coolant is already at around 223-225F, and from i remember in my logs, the fan low speed is not enough to prevent the coolant temp from raising up, (unless the Jeep is moving, but not going uphill), so you don't see the benefit of the fan in full order until the second stage of the fan kicks in at around 230+F, and that you can hear loud and clear.
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Old 05-31-2016, 04:25 PM   #12
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Maybe something that they don't allow you to adjust on your own ? i thought they did, but double checking right now with their website, it doesn't seem to be an option with Superchips , DiabloSports allows you to change this with their Intune/Trinity handhelds.

Can you log coolant temp with it ? You could check to see what you're ECT is doing, If so, check your coolant temp and correlate that with you fan engaged, typically the fan turns on 3-5F above the commanded temp, so in reality when you can hear the first stage of the fan, (i think you'll need to pop your hood to listen or watch the fan turn on), your coolant is already at around 223-225F, and from i remember in my logs, the fan low speed is not enough to prevent the coolant temp from raising up, (unless the Jeep is moving, but not going uphill), so you don't see the benefit of the fan in full order until the second stage of the fan kicks in at around 230+F, and that you can hear loud and clear.
Thanks. In thinking about it, another fan might be a viable option. A fan that you can program on its own to come on, at lets say 210F. Then the OE fans can either stay off all the time, or come on if the second fan can't keep up with the temps. The question would be where to install it? I read somewhere that putting it in front of the radiator as a push fan wasn't a good idea. Which leaves me asking why and then where would you put a second fan?

Being someone who learned auto repair in the 70's I can't wrap my head around a fan coming on at 221F. Especially in an engine that had a cylinder head problem related to poor cooling of the cylinder heads, and two revisions to the original design to fix it with the jury still being out.

Smart move getting that sucker to come on early!
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Old 06-05-2016, 04:14 PM   #13
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Friday driving from Albuquerque to Chaco national park hit 245. I've replaced the radiator with a Misimoto radiator, replaced the thermostat and had a cooling system flush done. 4.10 axel ratio with 315 70 r17 tires. Also have installed hood vents. Outside temp up to 90. Don't know what to do next. Still running too warm for me. Temp is off the trail dash. Temp gauge went up to 3/4 mark. Water pump? What else?
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Old 06-05-2016, 04:32 PM   #14
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Hi
I own a jeep jku 2012 shahara automatic , 4 inch lift kit ,35 tires ,bumpers etc .
Last month I recently purchased a ripp supercharger and installed it ,and installed the diablo that came with it ,since then i have been having problems with overheating needle at speeds of 70-80 or 4 wheel pushing it goese above half to 3/4 i checked all my radiator system took them out and cleaned them checked for leaks ,i even took the engine bonnet and front grill to see if it was a airflow problem and even got to the point of taking out my engine and taking out the head and changing the head gasket , still the temperature rises Above the half Marker,
This is frustrating and i cant seem to figure out what is wrong . If you have any ideas of how to help please let me know ..

Also my old diablo had a fan speed temp control so u could start the fan at low speed... With this new diablo that came with the supercharger i cant seem to control the fan speed is that coz its already set in the super tune if so whats the soulotion to getting the fan to kick in at lower speeds ??
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Old 06-05-2016, 04:37 PM   #15
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Hi
I own a jeep jku 2012 shahara automatic , 4 inch lift kit ,35 tires ,bumpers etc .
Last month I recently purchased a ripp supercharger and installed it ,and installed the diablo that came with it ,since then i have been having problems with overheating needle at speeds of 70-80 or 4 wheel pushing it goese above half to 3/4 i checked all my radiator system took them out and cleaned them checked for leaks ,i even took the engine bonnet and front grill to see if it was a airflow problem and even got to the point of taking out my engine and taking out the head and changing the head gasket , still the temperature rises Above the half Marker,
This is frustrating and i cant seem to figure out what is wrong . If you have any ideas of how to help please let me know ..

Also my old diablo had a fan speed temp control so u could start the fan at low speed... With this new diablo that came with the supercharger i cant seem to control the fan speed is that coz its already set in the super tune if so whats the soulotion to getting the fan to kick in at lower speeds ??

Forgot to mention also had this prob be4 the ripp super but nowhere neer as bad as now its like the super is just magnifying it !

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