Engine overheating, no visible coolant leak - Dodge Cummins Diesel Forum
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post #1 of 19 (permalink) Old 06-16-2019, 04:13 PM Thread Starter
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Engine overheating, no visible coolant leak

We towed our 5th wheel to Hot Springs, AR and truck overheated to 245 deg because of a coolant leak at the o-ring in the EGR cooler inlet tube. After repairing the leak and refilling the radiator the truck is fine for about 30 minutes of driving. After a while the temp goes up to 220 to 223 and stays there. After stopping and letting the engine cool I added a gallon of coolant, then drove the truck and the same thing happened. The truck is not running bad and there is no smoke or steam from the exhaust pipe. It has done this 3 times and it takes about a gallon of coolant each time.
Could there be air in the coolant system causing this or what???


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post #2 of 19 (permalink) Old 06-16-2019, 04:37 PM
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Are you deleted? could be air in the system, have you opened up the air valve by the O ring you are talking about? No coolant coming out of your overflow bottle?
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post #3 of 19 (permalink) Old 06-16-2019, 04:55 PM Thread Starter
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Are you deleted? could be air in the system, have you opened up the air valve by the O ring you are talking about? No coolant coming out of your overflow bottle?
Nope not deleted. There's no coolant coming from the overflow bottle. Sorry but I don't know what air valve you are talking about, this is our first 6.7.

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post #4 of 19 (permalink) Old 06-16-2019, 06:13 PM
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I would bet you have a cracked EGR that Is presenting itself when the cooler heats up.

Just a random internet guess though.

Good luck


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post #5 of 19 (permalink) Old 06-16-2019, 06:24 PM
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Originally Posted by Carpcatcher2 View Post
Nope not deleted. There's no coolant coming from the overflow bottle. Sorry but I don't know what air valve you are talking about, this is our first 6.7.
Valve on top of this pipe circled in yellow!! But as stated you may have a cracked EGR Cooler....
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post #6 of 19 (permalink) Old 06-16-2019, 07:38 PM Thread Starter
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EGR cooler leak???

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Originally Posted by dillonjm View Post
I would bet you have a cracked EGR that Is presenting itself when the cooler heats up.

Just a random internet guess though.

Good luck
Thanks dillonjm!!
I just ran the engine up to normal temp, 190ish, for about 20 minutes. I killed the engine, I let it cool some, and took off the EGR tube that connects to the intake. The tube was wet inside. Is there any normal reason for it to be wet inside???

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post #7 of 19 (permalink) Old 06-16-2019, 07:45 PM Thread Starter
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Thanks SRich12
I hope it is as easy as a cracked EGR cooler and not a blown head gasket or a cracked head!!!

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post #8 of 19 (permalink) Old 06-16-2019, 09:29 PM
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Quote:
Originally Posted by Carpcatcher2 View Post
Thanks dillonjm!!
I just ran the engine up to normal temp, 190ish, for about 20 minutes. I killed the engine, I let it cool some, and took off the EGR tube that connects to the intake. The tube was wet inside. Is there any normal reason for it to be wet inside???
There should not be coolant flowing into the intake from the EGR through that tube. Sounds a lot like a crack in the EGR cooler to me.
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post #9 of 19 (permalink) Old 06-17-2019, 02:47 PM Thread Starter
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In the shop!!

The truck is in the shop today. We have an extended warranty on the truck so maybe it won't break the bank to get it repaired!! I'll post results of the diagnostic work. $$$$
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post #10 of 19 (permalink) Old 06-23-2019, 09:24 AM Thread Starter
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The repair quote...$$$$$

Our truck is at the dealership now. They did a check on the EGR cooler and said it needed to be replaced. Along with that they listed a lot of other things that they felt should be replaced. The list goes like, all the exhaust components except the muffler, all injectors, EGR cooler, EGR valve, head gasket, all associated gaskets, and hardware to go with the parts.
The quoted repair cost with labor and core charges without tax is $21,339.
I talked to several folks back in TX while deciding what to do next. We know for sure the EGR cooler is leaking and must be replaced, all the other items there are things they say "should" be replaced. I asked them to replace the EGR cooler only and we would go from there. The dealership actually allowed us to furnish the parts for the repair. We ordered an EGR cooler kit from our favorite online store for about $400 and the dealer agreed to install it for $660 + tax.
Once the truck is running we will try to determine if the head gasket is really bad. What is the most accurate test for a bad head gasket on the 6.7 Cummins???

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post #11 of 19 (permalink) Old 06-23-2019, 10:47 AM
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Drive it.

Typically it will puke out of the overflow tank if it’s bad as the exhaust gasses get pushed into the coolant.

I’m betting the EGR cooler fixes your issues.

That list looks like typical dealer bull.

You can also test the coolant for signs of combustion gasses.
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Last edited by dillonjm; 06-23-2019 at 10:51 AM.
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post #12 of 19 (permalink) Old 06-23-2019, 12:27 PM
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That dealer practically wanted to rebuild your engine. What’s the point of the warranty if they charged 600 to replace a part you bought? What’s the point of the extended warranty if they are charging you 23k! I’m confused
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