Coolant Temperature

[HYRYSC]

Have had my 2020 Rubicon 3.6 for a bit over a year now and have put about 16000 miles on it during that time and they have been flawless.

However I was driving the other day and just flipped over to see the coolant temperature and noticed that it was hovering right around 220. A bit warm for my liking but the gauge on the side was still showing a bit below the mid mark.

When I push it pretty hard it gets a bit over 230 before dropping back down. I have noticed that normal driving through town typically yields pretty average temperatures but once it hits over 215 or so, it seems to stay pretty high regardless.

I have read a bit about this and it seems that the engineers (or at least the folks that write the specs) don't have any issues with these temperatures and have up to 235 as normal operating temperature.

I offroad this regularly and it has never gotten hotter than this but I still think this seems pretty high.

What are your experiences

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[smlobx]

What you see is pretty normal. I was going up a 7% grade yesterday fully loaded with my overlanding gear and hit 230 for an extended time but as soon as I crested the hill it dropped back down…

 

[ATL_Rubi]

You’ll also find that after running at a steady temp for say.. 10 minutes or more, then coming to a stop, the coolant will rise. I easily see 230-240 during Atlanta traffic in the height of summer. I’d worry more about oil temp than coolant

 

[JohnWick]

Normal operating range, non issue.

 

[RickF]

Do you have a Tazer on it? If so, pressing these two buttons simultaneously will turn the radiator fan on high, which always brings coolant temp down to 185 within a minute. Perhaps it's unnecessary, but I do this often, especially before leaving it parked with the engine so hot.

 

[ShadowsPapa]

However I was driving the other day and just flipped over to see the coolant temperature and noticed that it was hovering right around 220. A bit warm for my liking but the gauge on the side was still showing a bit below the mid mark.

That's nothing. A thermostat isn't even fully open before that point.
Don't freak out over the numbers because now we can see them.

I have posted diagnostic info from TSMs in the past showing that some vehicle stats aren't fully open until about 225 degrees.
Running too cold will reduce oil life and result in sludges and acids.

With a 50/50 mix of antifreeze (coolant) and water, and a working pressure cap you are not going to see boiling until you hit about 261 degrees or so.

Apparently a lot of guys have never really worked a gas engine hard.........

~225-230 is nothing to worry about.

 

[RickF]

That's nothing. A thermostat isn't even fully open before that point.
Don't freak out over the numbers because now we can see them.

I have posted diagnostic info from TSMs in the past showing that some vehicle stats aren't fully open until about 225 degrees.
Running too cold will reduce oil life and result in sludges and acids.

With a 50/50 mix of antifreeze (coolant) and water, and a working pressure cap you are not going to see boiling until you hit about 261 degrees or so.

Apparently a lot of guys have never really worked a gas engine hard.........

~225-230 is nothing to worry about.

Helpful to know. Thanks.

 

[willys 41]

Have had my 2020 Rubicon 3.6 for a bit over a year now and have put about 16000 miles on it during that time and they have been flawless.

However I was driving the other day and just flipped over to see the coolant temperature and noticed that it was hovering right around 220. A bit warm for my liking but the gauge on the side was still showing a bit below the mid mark.

When I push it pretty hard it gets a bit over 230 before dropping back down. I have noticed that normal driving through town typically yields pretty average temperatures but once it hits over 215 or so, it seems to stay pretty high regardless.

I have read a bit about this and it seems that the engineers (or at least the folks that write the specs) don't have any issues with these temperatures and have up to 235 as normal operating temperature.

I offroad this regularly and it has never gotten hotter than this but I still think this seems pretty high.

What are your experiences

I have posted this many times how I struggled with getting my coolant temps under control.
The way your cooling system works is.
The thermostat starts to open at about 190 and is fully open at about 212.
The problem is with the radiator fan and when it come on.
The fan comes on at 221 at about 15% fan speed and at 231 about 75% fan speed.
This is to little to late.
The only solution I have found is the RPM Extreme JL Fan controller.
For the last 3 weeks I have put the RPM Extreme JL Fan controller to the test in Vegas, Sand Hollow and now in Moab.
For the first time I hit 212 for just about a minute put most of the time about 190 to 200.
My oil and coolant temps are down by 25 to 30 degrees.
Run this simple test. When you see high temps turn your A/C on full blast and you will see you temps drop. Turning on your A/C your radiator fan will run at a high rate of speed keeping your temps down.

http://www.rpmextreme.com/Product/311/Jeep-JL-PWM-FAN-CONTROLLER.aspx

 

[Hootbro]

Yeah, normal. Just me, but if I had bought it used also, I would be doing a coolant replacement. No telling how they may have topped it off possibly with wrong coolant and or tap water.

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