Overheating issues 2023 JL

[stumblinhorse]

I am sorry, but saying no data? Are you kidding? Go into any CDJR dealership and there is a half dozen blown head gaskets or warped heads or blocks…

These newer engines are a little dirt on the radiator or light bar blocking the air flow away from limp mode or a blown head gasket.

Sponsored

 

[Willys41]

I guess I don't really know if 240 degrees is bad or not. I know we are talking about the 3.6 but when my 2.0 hits 240 the cruise control shuts off and won't turn back on until I turn the Jeep on and off. At 240 it also goes into limp mode. I have to floor it and shift down to keep it at 55 mph. This makes me think 240 is too high.

I'm not an auto engineer (I'm mechanical) but it seems the limp mode is a dead giveaway that it's too hot.

Last time it overheated I was pulling the hill from Green River to the Moab turn off. I'm heading to Moab on the 27th and when I pull that hill I will use my JScan to crank the fan up too high and see if it overheats still. I'm hoping it doesn't.

As long as you are pulling air through the radiator you will see a huge difference in both coolant and oil temps

 

[Willys41]

We need to start a post. HAS YOUR JEEP GONE INTO LIMP MODE AND WHY

 

[mwilk012]

I guess I don't really know if 240 degrees is bad or not. I know we are talking about the 3.6 but when my 2.0 hits 240 the cruise control shuts off and won't turn back on until I turn the Jeep on and off. At 240 it also goes into limp mode. I have to floor it and shift down to keep it at 55 mph. This makes me think 240 is too high.

I'm not an auto engineer (I'm mechanical) but it seems the limp mode is a dead giveaway that it's too hot.

Last time it overheated I was pulling the hill from Green River to the Moab turn off. I'm heading to Moab on the 27th and when I pull that hill I will use my JScan to crank the fan up too high and see if it overheats still. I'm hoping it doesn't.

240 is too hot, and you should stop doing the thing that makes it get that hot. The setpoint of the fan has nothing to do with 240F.

 

[mwilk012]

I am sorry, but saying no data? Are you kidding? Go into any CDJR dealership and there is a half dozen blown head gaskets or warped heads or blocks…

These newer engines are a little dirt on the radiator or light bar blocking the air flow away from limp mode or a blown head gasket.

Coolant leak => overheat => damaged engine

exactly zero evidence of anything else.

 

[Willys41]

240 is too hot, and you should stop doing the thing that makes it get that hot. The setpoint of the fan has nothing to do with 240F.

Really
Then I guess I shouldn't have driven it up HW 80 to Lake Tahoe to the Rubicon trail
235 degrees and climbing. Luckily it hit the top of Donner pass
After fan controller same trip same outside temps topped out at 212 degrees
212 is when the fan controller come on at 75% fan speed

 

[TOTL Innovations]

I just went back and looked at our logs. For idle and crawl tests, the engine oil hovered between 214-219 for both hoods. Coolant tempt hovered between 218-220 but once the fan was on for the 35 mph test, there was an average 8 degree drop in coolant temp and 6 degree drop in oil temp when running our H.E.R.O. Hood.

 

[Byrds8]

Jeep isn’t the only one running engine temps high. GM is doing the same thing in the 5.3L in the Silverado and Sierra. I had a 2022 of both and both ran around 235 before the fan kicked into high to cool it down.

 

[stumblinhorse]

Coolant leak => overheat => damaged engine

exactly zero evidence of anything else.

I guess I am missing your point, or you are agreeing with me. That these engines are on the edge of overheating all the time. A minor issue, like a coolant leak or dirty radiator or blocked grill and they will overheat.

My 3.6 would be in the 230s on my daily commute. It wasn’t something I could just wait to get to work. So it would always overwhelm the cooling system and the fan would be running full and it would just get hotter. Luckily I would get to the top of the grade before limp mode.

Everyone acts like this doesn’t happen, but it does. They run too hot. The 392 coolant never gets that hot, but oil temp is high, but hot oil I can live with, and it has to be changed so frickin often it is like new all the time.

 

[Willys41]

I guess I am missing your point, or you are agreeing with me. That these engines are on the edge of overheating all the time. A minor issue, like a coolant leak or dirty radiator or blocked grill and they will overheat.

My 3.6 would be in the 230s on my daily commute. It wasn’t something I could just wait to get to work. So it would always overwhelm the cooling system and the fan would be running full and it would just get hotter. Luckily I would get to the top of the grade before limp mode.

Everyone acts like this doesn’t happen, but it does. They run too hot. The 392 coolant never gets that hot, but oil temp is high, but hot oil I can live with, and it has to be changed so frickin often it is like new all the time.

I am agreeing with you.
The Wrangler and Gladiator run way to hot whether you have the 2.0 / 3.6 / 3.0
One thing I want to point out. What you think is the fan running full speed when temps hit 231 is not true. The fan comes on at about 15% fan speed at 221 and about 75% fan speed at 231.
I know this because with the RPM fan controller when you hit the 100% fan speed by pass it spins much faster and sounds like a plain taking off.
I have read several places that a few years back they had a software update that reduced the fan speed because people where complaining about the noise the fan made.

 

[roaniecowpony]

For all that believe Jeep's engineers are infallible.

Here you go. 33,000 miles, never raced or wrecked. Oil changed well before the OLM and with oil much better than specified by the engineers, driven mostly conservatively by a little old man.

Who puts an oil port adjacent to a coolant port with a siamese seal and no separation? FCA engineering at it's finest.

 

[CarbonSteel]

My oil cooler started leaking at 50K, but it was not evident until 70K when the potassium levels became evident which had started rising at 50K.

My 3.6L typically ran 224°F-235°F UNLOADED driving down the highway. After I changed, the oil cooler, I did a couple of short oil change intervals to flush out the remaining potassium.

I then resampled the oil and found the potassium levels were still rising. The only logical conclusion is that at that point either I had a partially blown head gasket or cracked head or block.

I attribute that to two things:

1. An 11:1 compression ratio
2. High operating temperatures

I've said this before I have owned dozens of vehicles in my lifetime and this Jeep Wrangler is the only one that ran that high of a operating temperature simply driving down the street.

In direct contrast, my Bronco has a very high output twin turbocharged engine and I have yet to see the temperature rise above 212°F. That's even driving in the mountains where the oil temperature in the Wrangler could easily approach 240 or higher.

 

[CarbonSteel]

For all that believe Jeep's engineers are infallible.

Here you go. 33,000 miles, never raced or wrecked. Oil changed well before the OLM and with oil much better than specified by the engineers, driven mostly conservatively by a little old man.

Who puts an oil port adjacent to a coolant port with a siamese seal and no separation? FCA engineering at it's finest.

1000%.

Combine that design with only five bolts to hold the unit down against the block and add the operating temperatures that we are seeing is a perfect recipe for the situation you just experienced.

This is incredibly $hitty engineering to do what exactly? Save weight?

 

[Willys41]

I find it extremely funny that people will do all kinds of mods to improve there jeeps.
Springs / tires / axles / drive shafts / wheels and a lot more.
Put when it comes to fixing or modifying cooling system they have a problem with it.
We all know that the jeep has many weak points and the cooling system is just another that has to be addressed.

 

[mwilk012]

I guess I am missing your point, or you are agreeing with me. That these engines are on the edge of overheating all the time. A minor issue, like a coolant leak or dirty radiator or blocked grill and they will overheat.

My 3.6 would be in the 230s on my daily commute. It wasn’t something I could just wait to get to work. So it would always overwhelm the cooling system and the fan would be running full and it would just get hotter. Luckily I would get to the top of the grade before limp mode.

Everyone acts like this doesn’t happen, but it does. They run too hot. The 392 coolant never gets that hot, but oil temp is high, but hot oil I can live with, and it has to be changed so frickin often it is like new all the time.

A coolant leak is never a minor issue and the difference in 230 and 180 is negligible compared to the actual core temperature when flow instabilities occur due to a loss of coolant. Your vehicle is never going to go to limp mode from driving down the highway. If you are able to overwhelm your cooling system's capacity, you have a malfunction or are exceeding the operating limits.

Sponsored