6.7 Overheating!?

[RSchwarzli]

So I have a guy in the club that has a 2011 3500 Dually Mega that is overheating. The dealer has looked into everything and cant find the issue.



He does have a basic HS kit on it, but I cant see that causing a over heating issue.



Anyone have any thoughts on this one?



Thanks,

 

[Jim W]

How about an air-lock in the cooling system? Did the dealer bleed the cooling system using the air bleed tube?



I know the dealer may not want to hear this but another issue could be either a plastic plug could have been left in the system blocking flow or a passage was not drilled in the block.



I complete tear down maybe required.



The shop mechanics hated to hear this from me when I would require a tear down of the complete cooling and hydraulic systems when something did not flow right on the test stand.



Jim W.

 

[jaird]

So I have a guy in the club that has a 2011 3500 Dually Mega that is overheating. The dealer has looked into everything and cant find the issue.



He does have a basic HS kit on it, but I cant see that causing a over heating issue.



Anyone have any thoughts on this one?



Thanks,

What is an HS kit?

 

[HBarlow]

What is an HS kit?

I don't know either but will guess he means an H&S delete kit which is likely to void his warranty unless the dealership has no trained Cummins techs in their service department.

 

[RSchwarzli]

How about an air-lock in the cooling system? Did the dealer bleed the cooling system using the air bleed tube?



I know the dealer may not want to hear this but another issue could be either a plastic plug could have been left in the system blocking flow or a passage was not drilled in the block.



I complete tear down maybe required.



The shop mechanics hated to hear this from me when I would require a tear down of the complete cooling and hydraulic systems when something did not flow right on the test stand.



Jim W.

Yes, they did the correct bleed. This has also not been there since day 1 from what I gather and he has a bit of mileage on it.

What is an HS kit?

I don't know either but will guess he means an H&S delete kit which is likely to void his warranty unless the dealership has no trained Cummins techs in their service department.

Correct. Was not used for performance purposes and therefore never had a performance tune on it.



As he is paying for the work, this is why he is looking for more info.

 

[sag2]

First of all you need to clarify what overheating means. Is it getting hot on the gauge, loosing coolant, both?

If the gauge indicates hot, how hot and under what conditions?

 

[BEmmert]

There seems to be a growing number of head gaskets going south with the H&S kits after pulling heavy. So might be something to look into concerning that.

 

[craiggo]

I just pulled 10k over the Grapevine at freeway speed and never saw 210*. I think 204 was the max. I'm really impressed with this thing.

 

[WMoroni]

My 2011 C&C had major cooling problems. Would run hot trying to tow anything. Was okay when empty. My current 2011 has no issues at all. I know the dealer changed the fan clutch, thermostat, water pump and I traded trucks so I don't know what else. Not sure if they found the problem or not.

 

[PLefever]

The cab and chassis EGR system operated differently then the pickup, my 011 4500 overheats with any kind of real load, unplugged the egr, presto, no more problems. Have been told by the dealer the pickup has an egr bypass? C&C does not. its a POS, dodge currently has no fix for mine so it continues to run with egr unplugged

 

[HBarlow]

That problem may occur on the Gen IV trucks. It does not on my '08. I have pulled my 14,000 fifthwheel north on I-15 from San Diego to Las Vegas and from Pahrump into LV in summer temps as well as lots of other long pulls with no heat issues at all.

 

[rscurtis]

The "EGR bypass" you refer to is not an EGR bypass, it is an EGR cooler bypass to enhance engine warm up. The EGR is still being used, it is just not being cooled.

 

[RVTRKN]

I might be mistaken, but didn't the software change so they would run warmer in the 4th gen's to meet the latest EPA requirements.

 

[HBarlow]

I might be mistaken, but didn't the software change so they would run warmer in the 4th gen's to meet the latest EPA requirements.

I don't know the answer but that's a good thought! That's the kind of crap the EPA forces on us.

Have you ever seen overheating with your C&C? I have never seen any tendency to overheat with mine and now have 115k miles on it, many of them towing.

 

[RSchwarzli]

Yeah, I did a search. Never found a single issue on that!



They did pull the head and all looked good. Waiting for head gasket to arrive as the nearest one here was 5 days out.

 

[RVTRKN]

Mine runs cool, even at 22K GCVW but it has only 37k on it. Seen temps over the 200 mark climbing Baker grade in 115* ambient temps and heard the clutch fan engage for the first time, but I consider that normal at 22k GCVW. I can't see my exact temperature.

 

[TFrench]

PLefever et al,

Can anyone tell me where I would look to disconnect the EGR cooler bypass?



I was I TRIED TO BY-PASS THE CUSSING FILTER-chatting with a co-worker today and he mentioned his father has a 2-3 year old Cummins diesel Ram that he pulls his 5th wheel between NY and FL. While in FL this winter, his Ram occaisionally overheats and/or dash lights go beserk mainly in stop and go traffic. To the best of my co-workers knowledge, the problem hasn't shown up when towing the 5th wheel.



Having a '97 Cummins myself, I'm not familiar with the EGR stuff but from what I've read here the regen seems to occur at low rpms... waiting for traffic lights, in one's garage etc. so the EGR bypass cooler seems like a good place to start since multiple dealer's haven't been able to identify or resolve the problem.



Any advice would be appreciated... . thanks much in advance,

Tim

 

[rscurtis]

AFAIK, the cooler bypass is used only to enhance engine warm-up. It should not be operational when the engine is warm.



If you have an overheating problem in slow traffic, you have an air flow problem, ie, the fan is not working as or when it should.

 

[HBarlow]

There is a lot of misunderstanding and misinformation about the regeneration process in the Dodge/Cummins ISB6. 7. Regen does not occur when in drive and stopping at a traffic light. If the engine is in regen when the truck stops regen will terminate after a few seconds. I doubt that could cause overheating. My truck certainly does not overheat anytime.

The reason for that misperception is drivers typically have no idea regen is in process while driving unless they have gauges installed but may detect a different exhaust sound at idle and a slightly more aggressive off idle throttle response when starting.

Regen can and does occur at idle and in Park under certain very specific conditions. I think it is called Net Zero. That is not related to the normal driving regen process.

 

[JGilbert]

I don't know the answer but that's a good thought! That's the kind of crap the EPA forces on us.



Have you ever seen overheating with your C&C? I have never seen any tendency to overheat with mine and now have 115k miles on it, many of them towing.

My 08 5500 just turned over 50,000 with approx 90% towing a 16,000 fifth wheel and now it is an 18,000 lb fifth wheel. I've never had an overheating issue. Not even when the water pump went south in Savannah a while back.



Joe