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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 10-13-2014, 11:45 PM   #1 (permalink)
04LB7GMC
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'12 LML using coolant

My 2012 has been using or loosing coolant for about a year or so now. Back in February the dealer replaced the lower radiator hose and overflow tank. It's still losing it somewhere but there's no sign of it anywhere. I'll be taking it back to the dealer soon. What else could it be? Upper radiator hose was not hard when the engine was cold so I think the head gaskets are ok. Any help would be appreciated.

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Old 10-14-2014, 07:28 AM   #2 (permalink)
gave20
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better get an oil analysis too

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Old 10-14-2014, 11:49 AM   #3 (permalink)
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04LB7GMC,

I understand you're experiencing some coolant concerns with your LML and are seeking some insight from members on the forum. I'd be happy to contact the dealer on your behalf and look into this further for you. Don't hesitate to send a private message if I can be of any assistance. Hope to hear from you.

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Old 10-14-2014, 05:35 PM   #4 (permalink)
NorCal2500HD
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Was the overflow tank they replaced a different design? In the last couple of months I was slowly loosing coolant and could not find a leak. Took it into the dealer a few weeks ago and they also couldn't find a leak but replaced the overflow tank (new design per TSB) which looks different than my old one. So far it has held up and I'm no longer loosing coolant.
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Old 10-14-2014, 10:51 PM   #5 (permalink)
04LB7GMC
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The new one they put in looked similar to the one that came with the truck, I'll have to look into that. Also my oil doesn't smell or look like there's coolant in it.
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Old 10-15-2014, 02:21 PM   #6 (permalink)
Ron Nielson
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Quote:
Originally Posted by 04LB7GMC View Post
My 2012 has been using or loosing coolant for about a year or so now. Back in February the dealer replaced the lower radiator hose and overflow tank. It's still losing it somewhere but there's no sign of it anywhere.
A possibility is the EGR cooler. When these leak, they leak into the engine intake while it's running and the coolant is burned in the combustion chambers, so you don't see it coming out anywhere. I've been told it's impossible to externally test for the EGR cooler leak because it only leaks at high temps and only when the engine is running, and then not all the time when the engine is running, so very sporadic. No way to tell if this is true or not. If every other possibility is eliminated, this MAY be the problem. Pretty expensive to fix if you're paying out of pocket, about $1200 at a dealer/shop.

I jut had a leak from my truck and it was the o-ring in the lower radiator hose. I didn't think there was a leak, but coolant level did go down ever so slightly over time. Couldn't find the leak by looking at the truck, but happened to catch a fresh leak (just a drop) on the garage floor, plumbed up to the lower rad hose and sure enough, it was leaking. Easy fix.
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Old 10-15-2014, 05:15 PM   #7 (permalink)
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I would bet that there is a GM Service Bulletin covering this. Always a good place to check first with these trucks.
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Old 10-30-2014, 01:22 AM   #8 (permalink)
Ted White
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My 2011 had the EGR (Exhaust Gas Recirculation) Cooler problem. A weld in the cooler was faulty, allowing tiny amounts of coolant to get into the exhaust returning to the engine through the recirculation cooler. It would use about a half pint of coolant a month. The way it was PROVEN, was to send a sample of the engine oil to a lab - I used Blackstone Labs - and it came back with traces of coolant chemicals in the oil. You MUST get an oil sample analysed, as suggested by gave20.
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