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Discussion Starter #1
My 2014 jku temperatures on average is about 222-226. And that’s within minutes of daily “city” driving. The other day it went up to 231° and my Trail dash started beeping. I changed the thermostat a few months ago because it was cracked and ever since then it started to run “hot” my mechanic who replaced it said that it’s a norm thing on hot days. My buddy said it’s not supposed to run that hot and that my mechanic probably replaced the thermostat with an after market and that’s prob the problem. Anyone else have some advice for me before I go to Jeep?
 

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Mine ranges between 94c-96c (201F-204F), even on the hottest of days.

That aftermarket T-stat could be the issue.
 

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My '14 will run in the 220s' in traffic on really hot days. Usually runs between 199 & 204 on the highway and mildly warm days. I don't think 231 is too hot unless that is what it runs at all the time.
 

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Discussion Starter #5
Mine on the highway is 224-228 easy on days that aren’t above 90. Fan is loud and kicks on almost Immediately.
 

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My 2014 jku temperatures on average is about 222-226. And that’s within minutes of daily “city” driving. The other day it went up to 231° and my Trail dash started beeping. I changed the thermostat a few months ago because it was cracked and ever since then it started to run “hot” my mechanic who replaced it said that it’s a norm thing on hot days. My buddy said it’s not supposed to run that hot and that my mechanic probably replaced the thermostat with an after market and that’s prob the problem. Anyone else have some advice for me before I go to Jeep?
I see 226 a lot in slow traffic with 100+ outside and 231 sometimes - all stock.
fluid suburban driving 205-210
nothing really unusual in your numbers
any airflow obstructions? grill inserts? anything in from of the grille?
 

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in my '17 (all stock except K&N CAI) I see temps up to 231 when running on the highway in 90º+ weather. The weird thing is that the temp really doesn't go up much when I climb a big long grade, but it will drop 5º when I coast back down the other side.

When cruising the highway at 70, the temp seems to go up and down at random.

I only watch it when its really hot out - I should probably see how it behaves in more temperate conditions...
 

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I have stressed about this so much living in Arizona but I've never over heated and I've had the dealer check it out 3 times in the 3yrs I've had my jeep. I've hit 240 several times because the high speed fan kicks on a little later than I'd like. It's by design. Someone actually asked FCA about this on their 2016 as well and I saved the response. The response is below:


-----------------------------------------------------------------------



Due to numerous variables and operating conditions, the
information the customer is seeking is unavailable.
The temperature gauge shows engine coolant temperature.
Any reading within the normal range indicates
that the engine cooling system is operating
satisfactorily.

The gauge pointer will likely indicate a higher temperature
when driving in hot weather, up mountain
grades, or when towing a trailer. It should not be
allowed to exceed the upper limits of the normal
operating range.

Low end of normal is about 105 °F.
High end of normal is about 255 °F.
According to available information, transmission fluid temperature can be
20 °F hotter than the engine coolant temperature.

Jonathan D. Sanders
Fiat Chrysler automobiles (FCA)
Mopar Headquarters



----------------------------------------------------------------------


Fan Points:


  • Low speed fan first kicks on at 226
  • Hi Speed Fan kicks on at 235
  • Then it takes a while before the fan really starts going and finally cools things down. So it's pretty common to hit 240 and then it come back down.
  • My 2 jeeps(2016 and 2015) both do it here in AZ during the summer and occasionally on hills in fall/spring. One has a big winch on top of the bumper and the other is recessed, doesn't seem to matter.
  • My buddies JK had the same problem a couple weeks ago on the way home from Payson while climbing hills in the heat but he never got past 241. The fans work.


This is by design for emissions purposes and it sucks.

Now with the above said, I think it's nuts to say up to 255 degrees is "normal" operating range BUT I have had it documented and have the Mopar lifetime warranty so it's not my dime if it blows up. I am a huge fan of the EVIC for monitoring the jeep and if it ever hit 245, I'd recommend you get out of the throttle and coast until it cools off.

I need to find some time to look into a secondary cooling fan or other way to drop temps on a hill climb. It's hard when we have a trans cooler and condenser that gets the cooling before the radiator.
 
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Discussion Starter #10
I have grill inserts but have never had this problem before with it. I just put my spare back on with the a rugged ridge support for the 35” spare. I wasn’t sure if it’s from all the weight (front/rear steel bumpers with winch, 35s on stock rim. Rubi side rails, and 2.5” lift) on 3.21 gears on top of the thermostat replacement. I’ve seen the temperature gauge move to almost 3/4 the one time it hit 231° on my traildash. At 228 it’s a little past the 1/2 mark. I just don’t want my engine to blow or something
 

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I too am experiencing small heat issues. My 2012 jkur 3.6 auto is also running a little hot about 225-230 and friggin jet fan comes on during a short drive when gauge is just past the center mark, takes like 3-5min to turn off and cool. Coolant levels all good and tstat opens. Changing out the coolant sensor to see if this helps already have a new tstat, did full back flush after changing oil cooler and upper lower rad hoses. However I did add plastic grille inserts too, really could it be the poor design of RR grille inserts??? time will tell.....
 

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I suggest before installing any grille inserts calculate the surface of inserts openings and then subtract from the grille openings to find out how much you are blocking.
The ones with round holes (easier to calculate) if I remember correctly are blocking roughly 40%, steel net type less than that but still a lot ~25%.
In order to install grille mesh or inserts on JK, grill openings need to be increased, what actually they did on JL, otherwise with 40% air flow decrease any vehicle will overheat.
Even blocking 20% is not a good idea cause in real world radiators are never perfectly clean, therefore a certain percentage of radiator cells are blocked by "natural causes" -debries, dust, insects.
 

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I suggest before installing any grille inserts calculate the surface of inserts openings and then subtract from the grille openings to find out how much you are blocking.
The ones with round holes (easier to calculate) if I remember correctly are blocking roughly 40%, steel net type less than that but still a lot ~25%.
In order to install grille mesh or inserts on JK, grill openings need to be increased, what actually they did on JL, otherwise with 40% air flow decrease any vehicle will overheat.
Even blocking 20% is not a good idea cause in real world radiators are never perfectly clean, therefore a certain percentage of radiator cells are blocked by "natural causes" -debries, dust, insects.
And the engineers today have really not designed the cooling system with much over capacity. In the old days, most of the radiators were oversized and cooling was never an issue as long as your thermostat was working and the system was full. Now, they have designed the capacity to be extremely close to being undersized and any little disruption is very noticeable via increased operating temperatures.
 

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These are my current temps on 2012 3.6l from cold start:

Cold start in park after 5min 208.....
rDB529w8RvK0FUUqDHSnRg.jpg

10min still idle'ing in park fan kicks on 230:
X4ThrwuhRdWyHuv+HOHcNg.jpg

5min fan running still in park cools down and fan turns off 212:
EvfRwKQLRDeMg0Mii+9pNg.jpg

Process repeats every 5-10min no mater what.

I've owned this Jeep since 2011 and never had this issue until earlier this year and changed tstat, stant cap, hoses and back flush thru HCore. However I do not have any heat - only AC. This is another issue I was planning to deal with after summer. Could there be a connection or what other areas should I look at other than removing grille inserts and changing coolant sensor? Could it be time for new radiator with 69k? Gotta love the JEEPLYFE :)
 

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Are T-stat and cap OEM? Thats not necessarily the reason but aftermarket are sometimes out of correct parameters.
Since you flushed the H-core - the coolant is circulating through it, you don't have heat for other reasons?
 

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Are T-stat and cap OEM? Thats not necessarily the reason but aftermarket are sometimes out of correct parameters.
Since you flushed the H-core - the coolant is circulating through it, you don't have heat for other reasons?
Autozone Duralast tstat . Cap is 18lb duralast slant. both installed 4 months ago.

Heat issue I believe is the Actuator door but I have not ripped out the dash to inspect yet was going to wait till it cools down a bit.
 

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Autozone Duralast tstat . Cap is 18lb duralast slant. both installed 4 months ago.

Heat issue I believe is the Actuator door but I have not ripped out the dash to inspect yet was going to wait till it cools down a bit.
Mine at idle would cycle 208-226, I had 231 once or twice though.
Maybe has something to do with the electrical part of the fan? Grounds, coolant temp sensor is reading 4 degrees higher.
How is temp driving on flat road with 50-70mph?
 

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Mine at idle would cycle 208-226, I had 231 once or twice though.
Maybe has something to do with the electrical part of the fan? Grounds, coolant temp sensor is reading 4 degrees higher.
How is temp driving on flat road with 50-70mph?
Not really an issue on flat hwys, only uphill, parked or idling in city traffic (no good). Fan blowing at full speed waiting at a red light next to a hottie she be like "wtf!!! fix your car dude".
 

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Not really an issue on flat hwys, only uphill, parked or idling in city traffic (no good). Fan blowing at full speed waiting at a red light next to a hottie she be like "wtf!!! fix your car dude".
Im not an expert, but if driving the temp is normal means that overall the system works, radiator, thermostat, pump are doing their job.
It looks to me more like a fan issue - I would check fan connectors and grounds.
 

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Got air trapped in the system? Took me a while to fully burp the system.
 
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