:welcome: to the forum. Those temps are considered normal, although running down the highway seems a bit high to me. My 2016 runs between 197F-201F on the highway. Having said that I prefer to use OE thermostats. I've had problems with aftermarket thermostats, and sensors over the years. Flame suit on.........

 

:welcome: to the Forum..:wavey:

 

Those are pretty much normal temps. In 2014 the engineers did something to programming or design that caused this. With these temp I have always worried about the longevity of the motor and suspect it will not last. Also you will hear a about 50% of the people say this is normal and 50% say that something is wrong. Most of the second 50% don't have an EIVC to see the actual temp and are relying on temp gauge, which doesn't move from center until about 230F. Because my off roading is in high altitude, I have to stop and allow the engine to cool on every trip as I do not like to see temps above 240 on the EIVC, which is something that is not unusual in 4 low crawling up something here in CO.

I have burped my radiator multiple times, I have modified Exhaust, intake, hood and I run 10w30 oil to combat excessive coolant temps. That is pretty much all you can do.

 

Thanks for the input. Maybe I’m just being paranoid. Even though I noticed lower temps before I swapped parts I never paid attention to it before.

 

those are normal temps for a JK automatic with AC (has 3 rads on the front). The rad fan does not kick on unless your temps hit 220F. you can manually engage the fan by turning on your AC system. You could also buy a tuner to change the programming so the fan kicks on sooner

 

What is the normal range of temp for the 2015 JK automatic?

 

I have a 2018 Wrangler sport bought new in March 2018. My engine temp gage constantly moves between 197 and 208 (up and down, up and down)at 50 degrees out side temp and the heater on and AC off. In case this helps you.

 

My temps get up to 240 on long grades with camping gear...

 

OP - For future reference, there are several OEM Mopar suppliers on the internet. The one I have used the most is: https://www.mymoparparts.com/

When I was buying a lot of parts for my TJ when I had it painted and replaced several 15 year old items, I found out their brick and mortar shop was Dallas Dodge (that's how it came through on my card charges).

Others I have used are:
https://www.quadratec.com/ (They not only have aftermarket/customization parts but also some OEM parts and aftermarket replacements by Crown and Omix/ADA. The only issue I have with Quadratec is they have way too much of my money. If you are going to spend a lot (new top for example) call them, let them know you are a forum member (they are a supporting vendor) and you want a quote. They give WF members a discount. I have found their customer service very helpful and gave me straight answers.

https://www.moparpartsgiant.com/

https://www.mymoparparts.com/

 

Great info!
I would have bought OEM if they had the part available and I was in desperate need of the part at
The time.

 

Couple of corrections for this thread so the confusion doesn't continue.
For 2014 model year and newer JKs:
Fan turns on at 226.
There is not a simple tuner that changes this setting. The only way to change this setting is with with HP tuner software on your computer plugging it into your OBDII port.
Not familiar with JL but on a JK, the temperature gauge will not move off the center tick until after 230. I assume the fluctuation that is being seen on a JL is based on the thermostat opening and closing, the EIVC on a JK will show this behavior until the t-stat is fully opened. The gauge will not fluctuate on a JK to show this.

 

Just wanted to let you know, the Flashpag by super chips is a hand tuner that DOES allow you to change the tmep at which the fan comes on. I have two JK's and 2 hand tuners. I adjusted the temps LOONNGG ago with no issues.

 

The JK has a 205 degree thermostat so running above that is normal in all but the coldest temps.

 

Couple of things:

0) It is possible that your old thermostat remained partially opened resulting in a cooler running engine

1) the coolant/water mix is way off. The coolant needs water in order to work properly - 50/50 or 70/30 depending on your local climate. 100% water works better, but freezes - hence the antifreeze.

2) Shit thermostat

3) Sensor has crap on it / was decrapped during this last change.

In other vehicles, Sometimes, after changing coolant, I have noticed the temps elevate as you have...Learned my less on with NON-NAPA or NON-OEM PARTS - I almost always traced it back to an inconsistent shit coolant thermostat - now, I only use OEM or the high end NAPA thermostat. Had one vehicle where the sensors was 'cleaned/decrapped' and effected reported temps...

 

Thanks for the additional information. I’m kinda leaning towards shitty thermostat. I don’t live anywhere near freezing temps. Thermostat says it’s a 203 degree thermostat. Once I hit and if I hit 220 degrees it drips down to as low as 214 a couple seconds later. I guess real test will be when summer comes back and I see if car starts spiking in temp.

 

Curious how a part from an offbrand on a coolant thermostat housing possibly increase
Overall temp? Not opening up at the correct temp? Not opening enough?

 

All of the above...

 

Copy

 

which thermostat did you use? I want some suggestions for my new car. I want to buy a new thermostat for my car.

 

Mopar thermostat

 

I have Stant 45359 model. Does mopar thermostats work well than this? Did you ever check it?

 

Just to give a little information from what just happened to me. About 6 months ago I had a cracked thermostat housing on my 2014 JKUR. I went down to my local NAPA auto and picked up a new thermostat assembly. Installed, bled and back on the road. Easy job. Since then, when driving down the road the jeep is running around 219*F on the the freeway and when I hit hills going up into the Sierras is getting up into the 230-240*F. Started checking all kinds of stuff since I had just put a new thermostat in, it could not be the thermostat. New radiator cap, bought the hydrocarbon detector kit to see if I had a cracked or warped head. This last weekend installed a new 1.5" Griffen radiator. A buddy of mine (who is a Toyota Guy) mentioned to me a while back that he has been burned by not installing OEM thermostats. I though it was BS, but this weekend went down and bought an OEM thermostat at the jeep dealership. Installed it yesterday and the problem is gone. Jeep is now running at 208-210*F going down the freeway 6th gear and if I drop to 3rd gear, 5500RPM, 65MPH for 2 miles I only get up to 222*F. Would not believe it if it had not happened to me, but the NAPA thermostat is junk.

 

Following

 

JKU 2012 and others the EOM thermostat OPENS at 195 Degrees.
I have read this and tested my EOM thermostat in 2019

Once it opens up, it just puts the radiator in line to cool.

My jeep mechanic replaced on October 2021 my radiator and thermostat with EOM radiator (even though I can not see the mopar logo next to the drain valve but it is BLACK coated like eom) and the thermostat is opening at 208-210 deg F. The jeep, comparing to my previous logs is running hotter.

in 2019 at 70 deg F, 6th gear I was running 214 deg F. Range was 203 F to 214 F

Now it opens up at 208 F ( I can not imagine doing any damage to the engine but I wished he would have put an EOM thermostat)
and runs 217-221. It is running warmer. Fans kick on as they should when in traffic and such.

There is a bunch of variables. I am not seeing anything over 230F though will worry in the summer when we are in main Miami South Florida heat.
It has 1 year warranty from the shop. I did bring this to his attention and also that the system was not bleed properly as my expansion tank when from middle to full low.

My question::
Is the thermostat opening at 210 deg ( 15 higher that EOM) any concern or am I just being to anal????

I know it is an old thread, but sometimes I prefer to revive than re-create.

 

From what I understand (I'm no expert) modern engines are designed to run at maximum efficiency at a certain temp. My thought is, that running at anything other than the designed temp will lessen the vehicle's efficiency.
I'd contact a knowledgeable Jeep mechanic and find out what the actual designed temp range is supposed to be. Perhaps your old thermostat was allowing your Jeep to run cooler than the designed range. A Factory Service Manual for your vehicle may have such detailed information.

In the big picture, I wouldn't be too terribly concerned, but with your apparent attention to detail, I think you would feel more at ease if you discovered the actual designed temp range.
I know what it's like to be so detailed oriented, it's a double edged sword. Sometimes it causes us undue worry and other times it saves us from disaster. We do what we do because of what we've learned in life.

Good Luck, L.M.

 

From decades of personal experience, I would never install anything other than a Stant or Super Stant at the manufacture specified temperature range. Many of the aftermarket junk and some OEM replacements are just getting too inferior, more stuck opens and incorrect temp opening are usually their downfall.