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  1. General Discussion
    I’m new took me 20 mins to find out how to post lol! I’ve got a 2004 lly duramax I just bought I’ve owned for less then 2 weeks! Test drove it twice no issues no leaks other then ac. Me and the lady decided to buy after everything cheeking out drove the beast home an hour away parked it got up...
  2. 911 Problems Forum
    on my way home i smelt a lot of coolant the coolant add sign came on the dash and the truck started getting hot so i pulled over and find this coolant leak busted and no coolant in the truck does anyone know what line it is called or how to buy one and why it busted was the turbo getting hot? i...
  3. 2011-2016 (Non Powertrain)
    2013 2500HD. One of the coolant connections coming off the firewall failed and I lost many gallons of coolant. I replaced the clamp and coolant weeks ago but I cant keep my reservoir full. Every day my coolant level light comes on an I have to add coolant. I can't smell coolant nor can I find...
  4. Maintenance
    Good morning … Wondering what is the book rate for changing all of the Coolant Hoses ( all 11 Coolant Hoses ) on a 2019 LP5. What is involved? Necessary to dismantle the Turbo? Difficult? Any suggestions please. TIA…
  5. General Discussion
    I have a 2011 lml that I’m needing some advice on. Every time I drive it I get a low coolant light as soon as it reaches operating temp. I had an issue with a stuck open thermostat so I replaced them about 6 months ago and shortly after would get low coolant light every once in a while but now...
  6. 11-16 LML Duramax Powertrain
    I have a 2015 GMC Sierra 2500HD with the LML. I had a coolant level low indicator on my dash and went to check it out under the hood. The coolant reservoir was empty so I started to slowly open the reservoir cap to add more fluid. As I did it started bubbling and the coolant level came right...
  7. General Discussion
    My 2011 LML is spraying out coolant from the over flow. Getting a low coolant light on dash. My upper hose feels completely empty. No pressure and cool to touch after driving. Put in new tstats about a week ago. At times my coolant temp will go down to 160 while driving and I lose heat from the...
  8. General Discussion
    I have a 2011 gmc 2500hd lml, it runs just fine but wen it's cold outside the heater takes forever to work and it fills both side of the coolant tank up full and blows out the overflow. The gauge works fine, when it does it it goes from around 180 to 230 in a split second then if I crack the cap...
  9. 06-07 LBZ & LLY Duramax Powertrain
    I wanted to see what y’all think. I just had HG replaced, engine studded, water pump replaced and oiler cooler gaskets done. Now I noticed it’s dripping from here when I stop and shut it off. I did have a coolant low 2 weeks after the shop visit added coolant seems good now. Even the hose...
  10. 01-04.5 LB7 Duramax Powertrain
    Yes another post but after hours and hours of researching i'm still not entirely sure. My only sign so far is a somewhat stiff upper radiator hose and some pressure in coolant reservoir after a day or so of sitting. Is that normal? Replacing the radiator cap seemed to actually alleviate a lot of...
  11. Gauges, Electronics and Wiring.
    I know there are alot of posts about the ect, I have read and read and not found my problem so starting a new discussion. 2008 6.6 lmm is the truck I was getting egr codes and engine coolant temp sensor codes, truck would go into limp mode. I completely replaced the egr valve, I did not do...
  12. 06-07 LBZ & LLY Duramax Powertrain
    Hey guys, I got a 06 lbz with 248k on it. I was daily driving it and i checked the oil every 2 days and it was perfect everytime. I started driving my lb7 everyday so the lbz sat for week but the other day i decided to take it for a trip and checked the oil and it read like 2 inches past the...
  13. Maintenance
    So I have a leak in my lower coolant, hose and while I’m still waiting for the replacement o ring to come in I need some help with the reinstall,alongside the original o ring was this plastic circle unfortunately when they fell out I didn’t get to see the order they go in so I don’t know if that...
  14. 04.5-05 LLY Duramax Powertrain
    I know this question has been posted in varius forms and forums, but i have added to many variables into the equation to immediately jump to a head gasket leak. The truck is a 4.5 2500hd gmc, mods that might have influence on the issue are, sinister egr delete, and banks intercoolers. The truck...
  15. General Discussion
    Have a 2011 lml experiencing low coolant. First started after driving a couple hundred miles knowing the coolant level was where it needed to be. Gradually got worse over time, but no change in performance. Recently had a large drop in coolant but the truck had been sitting for a good while as...
  16. General Discussion
    Alright boys, winter is quite literally just about on our front sidewalks. It's going to be cold and miserable, blowing snow, iced up windows and crappy dirty roads etc. we all know how cold blooded our rigs are if you live where it's cold. Now I'm not talking a paper thin sheet of ice cold I'm...
  17. 04.5-05 LLY Duramax Powertrain
    I have had this truck for almost a year. 130K. please see picture of coolant leak. is that the oil pan? I don't have much experience and appreciate all replies. leak started off intermittent, now just dripping away.
  18. 06-07 LBZ & LLY Duramax Powertrain
    I've had to to add a 1/4 of a gallon of coolant to my truck twice in the past 2 years (both times in February). The last time the Check Coolant warning came I let the truck sit in 30 deg weather to cool down and I still couldn't remove the cap due to all the pressure behind it. I had to use...
  19. 01-04.5 LB7 Duramax Powertrain
    Alright I think i'm running a wild goose chase now. I just did headgaskets in my '02 (have been back together for 1 1/2 weeks now) and i think i'm still slowly using coolant. On a cold start up I'm still getting clouds of white smoke out of my exhaust. The coolant level has dropped slightly but...
  20. 911 Problems Forum
    I have a 2001 Silverado LB7 that doesn't want to keep the anti-freeze down. For some reason when I top it off (because that annoying light will stay on) it will hold it for a little while (usually no more than 5 miles) and then pukes some of it out causing the low coolant light to come back on...
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