Diesel cooling options and ideas

[OrangeCJ]

Just got back from 3K mile trip to Bryce, Zion, Vegas. Altitude certainly puts stress on the system... If you are going 40-50mph, no problem, but the speed limit in Idaho is 80mph. Utah is 75-80mph too, and there is a lot of hills!

My Father-In-Law Derated TWO times in his JLDR, but only almost got ran off the road by a trucker one time, so I guess that is good.!?

I never Detrated, but I watched the oil temp constantly, and for 3K miles, that is tiring, not relaxing. I used the CoolDown feature on the Tazer ALOT, I mean ALOT! It seemed to help, but I always ran warm... I had my wife and daughter in the truck, 2 suitcases, a cooler, and my recovery gear... NOT TOWING.

My average freeway temp is 221... a slight hill takes temps up to 230-232... I have seen the derate at different temps... Not sure if it some issue with the programing of the vehicle when it spends its life at Sea Level? Seem like as soon as I start climbing at highway speeds anything could happen. My wife doesnt even want to take the vehicle to visit her family as she is worried it will shut down on her.

Not trying to be overly dramatic, but when you are merging on to a freeway with big rigs going 75-80mph and your truck just cuts the throttle and caps you at 50mph... it is actually scary.

This is a MAJOR issue that probably won't get fixed until someone get seriously hurt... as in ran off the road or in a major collision.

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[rharr]

Just got back from 3K mile trip to Bryce, Zion, Vegas. Altitude certainly puts stress on the system... If you are going 40-50mph, no problem, but the speed limit in Idaho is 80mph. Utah is 75-80mph too, and there is a lot of hills!

My Father-In-Law Derated TWO times in his JLDR, but only almost got ran off the road by a trucker one time, so I guess that is good.!?

I never Detrated, but I watched the oil temp constantly, and for 3K miles, that is tiring, not relaxing. I used the CoolDown feature on the Tazer ALOT, I mean ALOT! It seemed to help, but I always ran warm... I had my wife and daughter in the truck, 2 suitcases, a cooler, and my recovery gear... NOT TOWING.

My average freeway temp is 221... a slight hill takes temps up to 230-232... I have seen the derate at different temps... Not sure if it some issue with the programing of the vehicle when it spends its life at Sea Level? Seem like as soon as I start climbing at highway speeds anything could happen. My wife doesnt even want to take the vehicle to visit her family as she is worried it will shut down on her.

Not trying to be overly dramatic, but when you are merging on to a freeway with big rigs going 75-80mph and your truck just cuts the throttle and caps you at 50mph... it is actually scary.

This is a MAJOR issue that probably won't get fixed until someone get seriously hurt... as in ran off the road or in a major collision.

Try removing the engine cover and all that foam crap. If you have the rubicon, you can open up your hood vents.

Those 2 things seem to have helped me.

 

[CrazyCooter]

I keep saying people need to file a complaint with NHTSA or it will never gain traction. It's easy.....just file it online.

On my Husky 701 motorcycle, we had clutch slave failures for years and it was a known fact to just replace the unit because it would fail as soon as the way home from the dealer. The fix was the same failure prone part UNTIL I saw a post from a Canadian who reported it to the Canadian version of the NHTSA....... Less than 1 month later I got a recall notice! Coincidence? I think NOT!

I just filed mine.........You guys do your part now! https://www.nhtsa.gov/report-a-safety-problem#index

Be sure to include a detailed summary of your experiences. I think it's key to include IF your vehicle overheats/derates making it impossible to merge safely at the posted speed limit since this is the safety part of the problem. The towing is a secondary issue and that issue may never be fixed if it indeed meets/exceeds the J2807 test.

 

[OrangeCJ]

Try removing the engine cover and all that foam crap. If you have the rubicon, you can open up your hood vents.

Those 2 things seem to have helped me.

That is all done it does help, you are right... I also relocated my horns, this sucker just runs HOT... I did have my hood vents open with the sun was out, but kept them closed for the rainy parts . Good tips though, glad you pointed it out for other members!

 

[OrangeCJ]

I keep saying people need to file a complaint with NHTSA or it will never gain traction. It's easy.....just file it online.

Any possible repercussions from filing a complaint, like having your warranty status discontinued?

Just curious, only my second new vehicle ever, and never seen an issue like this before.

 

[CrazyCooter]

Any possible repercussions from filing a complaint, like having your warranty status discontinued?

Just curious, only my second new vehicle ever, and never seen an issue like this before.

Crazy to think a person should be worried about retaliation from FCA on a complaint like this.......

You can ask for your personal info not be shared with the manufacturer prior to the investigation. Eventually I'm sure the VIN's involved would have to be shared?

Maybe it's only 40 trucks with a certain vendor's part? Maybe it's every truck should they be lined up and operated under the same conditions? We will never know IF an investigation isn't launched right? So far nearly YouTuber's video I have watched with a diesel equipped Jeep has had the issue except for the guy here who got banned.........

I edited my post above with a link to file.

 

[jsalbre]

The problem you're going to find with a complaint is that it's operating to specs. The SAE J2807 towing tests states that the vehicle only has to make it to the top of the grade at 40 mph. If it's doing that then it meets the advertised requirement. The test also specifies that there *cannot* be any notices or warnings to drivers, so that's why you don't see a message that the truck is derating.

https://www.motortrend.com/how-to/1502-sae-j2807-tow-tests-the-standard/

 

[CrazyCooter]

The problem you're going to find with a complaint is that it's operating to specs. The SAE J2807 towing tests states that the vehicle only has to make it to the top of the grade at 40 mph. If it's doing that then it meets the advertised requirement. The test also specifies that there *cannot* be any notices or warnings to drivers, so that's why you don't see a message that the truck is derating.

https://www.motortrend.com/how-to/1502-sae-j2807-tow-tests-the-standard/

Agreed........The towing standard was probably certified.

There are also people here however who were not even towing, just stopped for fuel and could not merge onto the highway afterward due to heat soak. I have stopped the heat soak issue by just leaving the engine running while fueling even though that could create it's own hazards.

 

[jsalbre]

Agreed........The towing standard was probably certified.

There are also people here however who were not even towing, just stopped for fuel and could not merge onto the highway afterward due to heat soak. I have stopped the heat soak issue by just leaving the engine running while fueling even though that could create it's own hazards.

The heat soak issue while not towing is another situation entirely. That can probably be remedied by adjusting the cooldown timer on the fans, though this will of course require Jeep to modify the software.

I definitely agree that it sucks this is a conversation topic, but that's the unfortunate double-sidedness of standards. Now that they're using one they can just point to it and say "meets the standard, all good!".

 

[CrazyCooter]

The heat soak issue while not towing is another situation entirely. That can probably be remedied by adjusting the cooldown timer on the fans, though this will of course require Jeep to modify the software.

I definitely agree that it sucks this is a conversation topic, but that's the unfortunate double-sidedness of standards. Now that they're using one they can just point to it and say "meets the standard, all good!".

Mine overheats towing my 1100lb Tentrax up a 6% in 65° weather if you remember my thread. Not sure what it would do on the Davis Dam Grade.........It would probably go up at 40mph without overheating?

I'm not sure how well running the engine fan would work without the engine running? 70-80amp load at full speed, so that's quite a drain on a small battery? Even at half speed for 10-15 mins would be sketch on a 2 year old battery? I have a Gladiator in the shop today with a bad Aux battery, possibly a bad cranking battery, and it's not even 2 years old yet!

 

[jsalbre]

Mine overheats towing my 1100lb Tentrax up a 6% in 65° weather if you remember my thread. Not sure what it would do on the Davis Dam Grade.........It would probably go up at 40mph without overheating?

I'm not sure how well running the engine fan would work without the engine running? 70-80amp load at full speed, so that's quite a drain on a small battery? Even at half speed for 10-15 mins would be sketch on a 2 year old battery? I have a Gladiator in the shop today with a bad Aux battery, possibly a bad cranking battery, and it's not even 2 years old yet!

Running the fan (and an electric coolant pump) after shutdown is common practice on many forced induction vehicles. Our last 5 turbo VWs did that from the factory when it was hot. A full speed run shouldn't be necessary as there's no longer any heat generation.

I suggested it way back at the beginning of this thread, but I'll bring it back up again: an intercooler/radiator misting system might be a huge help here. It just sprays water on the cooling stack when temps cross a certain threshold. Properly implemented an intercooler vehicle can see intake air temps below ambient. I know the intake air temp isn't the main concern here, but since all of the cooling components are in one line on the JT spraying cooling water on one will help all of them.

 

[CrazyCooter]

Running the fan (and an electric coolant pump) after shutdown is common practice on many forced induction vehicles. Our last 5 turbo VWs did that from the factory when it was hot. A full speed run shouldn't be necessary as there's no longer any heat generation.

I suggested it way back at the beginning of this thread, but I'll bring it back up again: an intercooler/radiator misting system might be a huge help here. It just sprays water on the cooling stack when temps cross a certain threshold. Properly implemented an intercooler vehicle can see intake air temps below ambient. I know the intake air temp isn't the main concern here, but since all of the cooling components are in one line on the JT spraying cooling water on one will help all of them.

I probably have the stuff laying around to test a water spray setup, but I doubt it will fix it. Not only that, I would have to carry 5 gals of water on my already payload/space challenged truck?

I think the ticket is for the water/oil temps to not be so hot to begin with....then there wont be so much heat soak at shutdown and then a quick recovery for the heatsoak after stopping for fuel that could happen before hitting the highway?

 

[rharr]

Agreed........The towing standard was probably certified.

There are also people here however who were not even towing, just stopped for fuel and could not merge onto the highway afterward due to heat soak. I have stopped the heat soak issue by just leaving the engine running while fueling even though that could create it's own hazards.

That happened to me once on a 100+ degree day. I now leave it idling for fuel stops and let it idle for a few minutes if I am stopping to grab a bit to eat. It's all relative, if I am running around town, i worry less, if i am pulling off the highway from hour long 80mph cruise, i idle it.

 

[CrazyCooter]

That happened to me once on a 100+ degree day. I now leave it idling for fuel stops and let it idle for a few minutes if I am stopping to grab a bit to eat. It's all relative, if I am running around town, i worry less, if i am pulling off the highway from hour long 80mph cruise, i idle it.

I do this too, but idling while fueling is unsafe and possibly illegal in some areas? Idling an engine especially a diesel is also frowned upon and illegal in some areas.

 

[rharr]

I do this too, but idling while fueling is unsafe and possibly illegal in some areas? Idling an engine especially a diesel is also frowned upon and illegal in some areas.

Meh, i'll take my chances, can't make everyone happy.

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