What are your water temps on these new Hurricane I6's?

[AirRyan]

We have a MY24 GW with a HO Hurricane built in June 2024 and from what I could tell, there was a Jeep TSB 26B that said they traced back a defective water pump issue to the supplier, and it only affected about 5,100 units. I have my doubts as I have seen some people with MY24's now say they have had overheating issues. What water temps are you all seeing on your Hurricane I6's? Right off the bat I took a quick trip to Houston and back in the same day and I saw water temps rise to the low 220's for brief moments. I'm under the impression these motors like to run a little hotter but am curious if I'm maybe experiencing a sticking thermostat or if it is just completely normal.

 

[MotorcycleBoy]

Hi !
already on 5.7 the temperature reaches 230F for short moments (for example in city traffic) and now we are in winter !!
It might be right to write that these engines like to work hotter (let's hope)

 

[silver billet]

Hi !
already on 5.7 the temperature reaches 230F for short moments (for example in city traffic) and now we are in winter !!
It might be right to write that these engines like to work hotter (let's hope)

My coolant temps don't ever exceed 195F unless I'm towing in the summer. During winter months, I hover at 185 for weeks on end, city, highway, stop and go, doesn't matter. Perhaps sitting still at a drive through for 5+ minutes would do it? Haven't paid that much attention to it recently to be honest.

The beauty of a 180 tstat. I haven't tuned the fan to come on sooner so probably idling for a long time would still see the temp spike until the fan turns on.

Engines don't "like to work hotter". Heat kills/wears, always has. That's putting a human emotion on a machine that has had poorly calibrated tuning set from the factory. There is no need for them to run hot, they are programmed that way to help with emissions and fuel efficiency. Sometimes it's just as simple as swapping out the thermostat though that might be the advantage of running a 20 year old engine design, who knows.

 

[baf2000_1]

My 2025 Limited HO averages 220 often, I was wondering why so high myself. Given the high horsepower of these engines I would like lower temps with the aluminum head.

 

[HSKR R/T]

My coolant temps don't ever exceed 195F unless I'm towing in the summer. During winter months, I hover at 185 for weeks on end, city, highway, stop and go, doesn't matter. Perhaps sitting still at a drive through for 5+ minutes would do it? Haven't paid that much attention to it recently to be honest.

The beauty of a 180 tstat. I haven't tuned the fan to come on sooner so probably idling for a long time would still see the temp spike until the fan turns on.

Engines don't "like to work hotter". Heat kills/wears, always has. That's putting a human emotion on a machine that has had poorly calibrated tuning set from the factory. There is no need for them to run hot, they are programmed that way to help with emissions and fuel efficiency. Sometimes it's just as simple as swapping out the thermostat though that might be the advantage of running a 20 year old engine design, who knows.

180 thermostats were used to help with detonation on older inefficient engines, nothing more nothing less. An engine is more efficient at higher temps, as long as you can prevent detonation. More power, better emissions, better for the oil to burn off/evaporate the moisture/fuel that will get into the oil. No real benefits running a 180 thermostat, and actually worse for the oil.

 

[JBNCCCB]

I saw 225 Sunday pulling the boat with a 78F ambient temperature.

 

[MotorcycleBoy]

so I think that even on the 2025 they left the fan start-up temperature at 220F (like on the 5.7)

 

[bdm219]

So this coolant temp isn't anything I should worry about?

 

[HSKR R/T]

So this coolant temp isn't anything I should worry about?View attachment 198066

Not at all

 

[bdm219]

Not at all

Thank you, because I have been, lol.

 

[OkieDude]

So this coolant temp isn't anything I should worry about?View attachment 198066

Pretty normal temps. You have to remember that the twin turbos output air is being cooled through a water to air intercooler. Enjoy the drive!

 

[Willwork4truck]

180 thermostats were used to help with detonation on older inefficient engines, nothing more nothing less. An engine is more efficient at higher temps, as long as you can prevent detonation. More power, better emissions, better for the oil to burn off/evaporate the moisture/fuel that will get into the oil. No real benefits running a 180 thermostat, and actually worse for the oil.

Devils advocating now…
So maybe change oil more often if you want lower coolant temps.
What’s going to happen when you tow, especially up mountain grades, if you are already running at 220?
Nothing good, me thinks. Better have a good tranny cooler as well.

From a Jeep Wagoneer forum post dated March 2024:
“Engine failed under 20k miles, before failures and when operating good no complaints, relatively fast torque for boosted vehicle. Probably and most likely accounted for in the newer models, thermostat blew multiple engine seals, paper weighted the engine. Never towed with it, but I think it's definitely 450plus torque around 2300rpm on High Output.” (Bolding is mine)

And a different thread posting said this: “…I think the trick is to make sure you get the HD towing package, ensure the engine comes with the updated thermostat and all software updates have been applied to the several ECUs of the vehicle. Then, and maybe only then, the I6TT is better. Otherwise wait a few more years for the early issues of this new engine to be ironed out. At that point it will be unequivocally better than the V8s.” (Bolding is mine)

Even though the hurricane has been in the Wagoneer for like 2 years now, it doesn't seem that Stellantis has completely addressed the temperature/thermostat sticking issues that the motor has been having. Perhaps by late 2025 with more TSB’s or a redesigned set of parts (plastic to metal) or a “regular” T-stat.

Heres a summer 2024 posting (complaining of engine temp) with a screenshot.
243 degrees and only 23 psi for the oil at idle? No thank you sir.

 

[HSKR R/T]

Devils advocating now…
So maybe change oil more often if you want lower coolant temps.
What’s going to happen when you tow, especially up mountain grades, if you are already running at 220?
Nothing good, me thinks. Better have a good tranny cooler as well.

From a Jeep Wagoneer forum post dated March 2024:
“Engine failed under 20k miles, before failures and when operating good no complaints, relatively fast torque for boosted vehicle. Probably and most likely accounted for in the newer models, thermostat blew multiple engine seals, paper weighted the engine. Never towed with it, but I think it's definitely 450plus torque around 2300rpm on High Output.” (Bolding is mine)

And a different thread posting said this: “…I think the trick is to make sure you get the HD towing package, ensure the engine comes with the updated thermostat and all software updates have been applied to the several ECUs of the vehicle. Then, and maybe only then, the I6TT is better. Otherwise wait a few more years for the early issues of this new engine to be ironed out. At that point it will be unequivocally better than the V8s.” (Bolding is mine)

Even though the hurricane has been in the Wagoneer for like 2 years now, it doesn't seem that Stellantis has completely addressed the temperature/thermostat sticking issues that the motor has been having. Perhaps by late 2025 with more TSB’s or a redesigned set of parts (plastic to metal) or a “regular” T-stat.

Heres a summer 2024 posting (complaining of engine temp) with a screenshot.
243 degrees and only 23 psi for the oil at idle? No thank you sir.
View attachment 198596

With ko reference as to build dates of the engines in the posts you quoted, it's all pure speculation. They did have issues early on, in the Wagoneers" with quality control in the thermostats. That has since been addressed by the "updated" thermostat mentioned in one of your quoted posts.

Still has nothing to do with "normal" engine operating temperature. Quality synthetic oils are designed to operate at high engine temps, in excess of 250 degrees. So I don't see the devil's advocate aspect of your post. Seems it's more a lack of understanding.

 

[Willwork4truck]

I know I’m certainly not an automotive engineer or coolant specialist, I just go by (old) conventional wisdom.
I thought we were discussing coolant temps, not oil. I agree that quality synthetic oils can take the temperatures that you stated.

What I go by are statements like these (for coolants):
“Coolant temperature plays a crucial role in your vehicle’s performance. Normal operating coolant temperature usually ranges from 195°F to 220°F (90°C to 104°C). Staying within this range ensures efficient engine operation and prevents overheating.“. Source: carfluidguide.com

“The Dodge Ram 1500 coolant temperature should be between 195F and 220F during normal operation. Anything above that is considered high.”
Source: truckpowered.com

Previous thread on this forum on operating temperature (coolant) had a reply:
“I think the thermostat range is 204 - 220 or so, the fan usually kicks in at about 230F, at least on my 2019.
I typically don't see above 220F unless I'm in stop and go traffic or stuck at a stop light for a while. Even very slowly creeping up an off-road trail in the height of summer heat, I don't see more than 230F before it shoots down to 220F before the fan cuts off.”

You had replied to the same thread on June 6, 2024, something about: “Without a tune for the 180 stay, it won't do much”
Yet I am not following if you were agreeing to coolant temperatures or not.

Not interested in a pissing match.

What I have learned over the years is that you should keep coolant below 230 max. Maybe that is all “back in the day” information, like uhh, when auto manufacturers used whale oil in vehicle transmissions. (Most peeps under 50 would have no idea that was used.)
From Motorbiscuit.com
“General Motors takes up whale oil.
Whale oil was once regularly used for many applications, including in the automotive field. While modern-day transmissions use a lot of synthetic oils, whale oil used to be the fluid that kept automatic transmissions running. It was popular in the vehicles produced by General Motors up until the considerably recent past in the 1970s. According to the engineers at GM, whale oil was a great option because it prevented rust.”

 

[HSKR R/T]

I know I’m certainly not an automotive engineer or coolant specialist, I just go by (old) conventional wisdom.
I thought we were discussing coolant temps, not oil. I agree that quality synthetic oils can take the temperatures that you stated.

What I go by are statements like these (for coolants):
“Coolant temperature plays a crucial role in your vehicle’s performance. Normal operating coolant temperature usually ranges from 195°F to 220°F (90°C to 104°C). Staying within this range ensures efficient engine operation and prevents overheating.“. Source: carfluidguide.com

“The Dodge Ram 1500 coolant temperature should be between 195F and 220F during normal operation. Anything above that is considered high.”
Source: truckpowered.com

Previous thread on this forum on operating temperature (coolant) had a reply:
“I think the thermostat range is 204 - 220 or so, the fan usually kicks in at about 230F, at least on my 2019.
I typically don't see above 220F unless I'm in stop and go traffic or stuck at a stop light for a while. Even very slowly creeping up an off-road trail in the height of summer heat, I don't see more than 230F before it shoots down to 220F before the fan cuts off.”

You had replied to the same thread on June 6, 2024, something about: “Without a tune for the 180 stay, it won't do much”
Yet I am not following if you were agreeing to coolant temperatures or not.

Not interested in a pissing match.

What I have learned over the years is that you should keep coolant below 230 max. Maybe that is all “back in the day” information, like uhh, when auto manufacturers used whale oil in vehicle transmissions. (Most peeps under 50 would have no idea that was used.)
From Motorbiscuit.com
“General Motors takes up whale oil.
Whale oil was once regularly used for many applications, including in the automotive field. While modern-day transmissions use a lot of synthetic oils, whale oil used to be the fluid that kept automatic transmissions running. It was popular in the vehicles produced by General Motors up until the considerably recent past in the 1970s. According to the engineers at GM, whale oil was a great option because it prevented rust.”

That's the whole thing, most people's "conventional wisdom" when it comes to engine operating temperatures are based on older generations and what dad or grandpa used to do, or taught their kids. Modern engines with modern lu ricants and fuel blends operate more efficiently at higher engine temps, and are tuned for those temps. I don't know what the Hurricane thermostat rating is but on the hemis it's a 203 thermostat. If your Hemi is running at 195, it's running cold, and you might have an issue with your thermostat. I'd say 203-220 would be "normal" operating range. But I wouldn't start sweating until coolant temps reach 250, even on the Hurricane. The one post you quoted with the person concerned with 243 engine temps and 23psi oil pressure at idle is just ignkrsnce about his vehicle. Even amongst old school hot rodders, 10psi oil pressure for every 1000 RPM is considered safe. I'd be willing to bet his truck wasn't giving him any warning lights or beeps.

Now on my 99 and 2000 Dakota R/Ts with the old 5.9l Magnum, if my engine temps get above 220, I'm pulling over to let them cool down. But those engines weren't designed to run that hot.

I'm not trying to get into a pissing match I'm only staying facts to support my comments.

 

[Willwork4truck]

That’s fine. Since I’m old and mostly remember the old iron, I fully agree with your statements about old engines. All this new stuff is engineered by very smart people and it has loads of computers, sensors, tight tolerances etc. It’s certainly “not your dads’ engine”.

I’m not likely to overstress my current 2024 and 2025 model engines by towing heavy, driving fast or not having changed the fluids on schedule. I’ll just have to take the engineers word for what they can do.

Well except for the 170 mph analog speedometer in my new-to-me hand me down from wifey’s 2024 Buick Enclave with the 3.6 non-turbo engine.
Me thinks they didn’t think that one through. It literally has 90 mph up just past the 12 o’clock position.

What did the designers expect Buick drivers (whose average age is nearly the same as the DOGE findings of people over 100 years old getting Social Security checks) to do, drive that fast? We need the Jumbo print sized speedos, not limited to using 50% of the dial.

“…Hey, we have some C8 Corvette speedometers left over. What can we do with them?”

Here’s a picture/image from Google images of a 2023…

 

[Ramit392]

I have 2200 miles so far and my temp stays about 200 to 210. So far very pleased with my new Tungsten and like it very well.