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Old 10-26-2018, 04:01 AM
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New Coolant Thermostat

Good Evening,

New to posting here but have been casually reading for roughly 2 years. I have a 2015 Jeep Wrangler JK unlimited.
I recently discovered I had a cracked thermostat housing that was spraying coolant everywhere. If I recall my coolant temperature was anywhere from 190-208 from daily driving even after I noticed the crack with an empty coolant overflow reservoir. Those temperatures
Are to the best of my memory. I decided to try my hands and installing a new thermostat housing as the dealership was quoting me around $477 for parts and labor.

I was unable to find OEM but an off brand at a local Orielly auto shop. Installed it and have no leaks now. Burped the radiator to the best of my ability. Decided to have the coolant flushed as I felt I didn’t burp it good enough because now temps were in the range of 210-228. Had coolant flushed and burped at a near by shop and temps are still between 210-228. Driving on freeway it’s averages around 215 degrees. In the city and moving slowly and stop and go traffic. It’s running on average at 220 degrees.

I’m concerned that my temps are a bit high. Am I just paranoid and these are perfectly acceptable temps? Did I **** up along the way possibly? I’m no mechanic but try and learn.

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Old 10-26-2018, 04:09 AM   #2
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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.........
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Old 10-26-2018, 05:31 AM   #3
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Old 10-26-2018, 09:18 AM   #4
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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.
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Old 10-26-2018, 01:30 PM
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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.
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Old 10-26-2018, 04:09 PM   #6
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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
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Old 10-26-2018, 04:20 PM
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What is the normal range of temp for the 2015 JK automatic?
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Old 10-27-2018, 08:01 AM   #8
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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.
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Old 10-27-2018, 11:28 AM   #9
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My temps get up to 240 on long grades with camping gear...
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Old 10-27-2018, 11:43 AM   #10
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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/
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Old 10-27-2018, 04:46 PM
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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.
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Old 10-30-2018, 12:28 PM   #12
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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.
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Old 10-30-2018, 01:05 PM   #13
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The JK has a 205 degree thermostat so running above that is normal in all but the coldest temps.
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Old 10-30-2018, 01:38 PM   #14
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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...
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Old 10-31-2018, 05:02 PM
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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.
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Old 11-01-2018, 08:48 AM   #16
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Quote:
Originally Posted by stumblinhorse View Post
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.
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Old 11-01-2018, 09:04 AM   #17
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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.
After 2014 that doesn't impact that setting. You can check with Superchips... There are 100's of threads on this...
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Old 11-01-2018, 09:17 AM   #18
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Quote:
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After 2014 that doesn't impact that setting. You can check with Superchips... There are 100's of threads on this...
Does it work on an 07?
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Old 11-01-2018, 11:05 AM   #19
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Does it work on an 07?
Sorry, I am not familiar at all with the 3.8.
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Old 11-02-2018, 01:43 PM
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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?
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Old 11-02-2018, 04:36 PM   #21
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Quote:
Originally Posted by Leeyoungsb75 View Post
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...
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Old 11-02-2018, 06:40 PM
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Old 06-15-2019, 02:36 AM   #23
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which thermostat did you use? I want some suggestions for my new car. I want to buy a new thermostat for my car.
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Old 06-15-2019, 04:11 PM   #24
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Mopar thermostat
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Old 06-17-2019, 01:00 AM   #25
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I have Stant 45359 model. Does mopar thermostats work well than this? Did you ever check it?
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Old 07-09-2019, 02:07 PM   #26
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Quote:
Originally Posted by stumblinhorse View Post
After 2014 that doesn't impact that setting. You can check with Superchips... There are 100's of threads on this...
I just spoke to the folks at TrailDash/Flashpaq/Diablo Sport (same companies). I wish you were right GC- but I was informed that at this time only the Diablo Sport tuner will do this. And that tuner is rife with issues so I've eliminated it as an option.
The Bully Dog will allow you to turn the fan on....but not at a certain temperature. And you have to toggle thru several screens to do it. Because when I am driving up an incline and my temperature is pegging I have time to toggle through screens....

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