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  1. New Member Introductions
    I have a 2004 lb7 with 80k miles. im confused because not too long ago today a bunch of coolant spewed out of the overflow and had a lot of pressure. i dont think there is a head gasket issue because there is no condensation or blow by, etc. i need help, kind of thinking it is a thermostat. i...
  2. 01-04.5 LB7 Duramax Powertrain
    I have had a coolant leak going on a few months now and it has gotten to the point where it will not hold coolant at all. Finally found the hose that came disconnected. Can anyone tell me what part is missing in the connection? Will attach pictures
  3. General Discussions
    Well... my previous coolant problem has not been solved. I did do a block test to confirm that there is not any combustion gases present (thank goodness) however after spending time trying to track down this leak something odd happened. I had my no-spill funnel connected with about a quart of...
  4. 11-16 LML Duramax Powertrain
    I have a 2015 gmc denali LML. So i have been reading all posts about losing coolant, with the overflow tanks, the egr valves, head gaskets, etc. My story is like most others. Started off losing a little coolant, and the low coolant advisory would come on every once in awhile. Id top it off and...
  5. General Discussions
    This is the 2nd time this winter my truck has some coolant under it, both times from when I go to start it when it’s been pretty cold out. What’s weird to me is it only seems to leak when the truck is starting for the first time that day in the cold. Once it’s started it doesn’t leak for the...
  6. Maintenance
    Hello, New user here. Forgive me if Isuzu engines aren't catered to in this forum but as I understand it Duramaxes are largely Isuzu engines or at least were in the early days. I'm hoping someone can guide me as to what coolant would be best for my 2006 GMC W4500 with the 5.2 Isuzu 4HK1-TC...
  7. Maintenance
    i’m buying an 2013 2500hd lml with 225k miles from a used car dealership and when i let the radiator cap off to check for pressure and it let out a small hiss should i be worried?
  8. General Discussions
    UPDATE BLOWN HEAD GASKET!!! 6000.00 BUCKS TO REPLACE, WHICH I DO NOT HAVE. TRUCK IS IN GREAT SHAPE, NEW BOSH INJECTORS, GOOD TIRES, VERY CLEAN. ABOUT 320.000 MILES ON HER. WHAT DO YOU THINK SHE IS WORTH?? ANY IDEAS? I JUST FOUND OUT ABOUT THE HEAD GASKET AND NOW MY HEAD IS ABOUT TO...
  9. General Discussions
    My 07 LBZ is losing coolant only while towing when it’s not towing it’s fine. It doesn’t lose pressure when pressure tested, there are no visible leaks, I took it to a shop and they think head gaskets but aren’t sure because it holds pressure when pressure tested but they want 9k to do a head...
  10. 2001 - 2007 (GMT800) Non Powertrain
    I've noticed some red fluid hanging around on these metal fittings. It is to my knowledge, that line only carries atf and not coolant, even though that line connects to the main radiator. But I also have a slight coolant leak. I'm maybe a quart below the fill line after running about 7k miles...
  11. General Discussions
    Hey guys, I couldn’t find much on here for my issues so I thought I’d make a new post. I have a 2006 LBZ with an Allison, it’s got 280K miles. I bought it a few months ago, it’s my first diesel and it’s been one problem after another. I recently did the water pump and after multiple coolant...
  12. 911 Problems Forum
    So I have a 2012 LML and my EGR cooling feed pipe (part Number - 12641851) has a hole in it. ive been told so many different things about the replacement of this hose such as pulling the cab or dropping the transmission and i saw a video on 2016 which told me i didnt have to do any of those...
  13. 911 Problems Forum
    So I have a LMM and never really had any problems with it. Had for 6 years and put about 125k on it. Its sitting at 215k and today the low coolant light popped on, Its the first time I've seen it on the truck. So I was driving down to the store to find some coolant for her, and there was a new...
  14. 07.5-10 LMM Duramax Powertrain
    Hi everyone. Been looking at possible symptoms of HG failure on my LMM. Started with pressure after being shut off overnight, then slight coolant loss, and just recently seeing the temp gauge go from running temp, all the way down and then a few minutes later back up again within the first...
  15. 01-04.5 LB7 Duramax Powertrain
    So I bought an 2002 Chevy duramax about 2 and a half months ago and I’ve been driving the truck and been losing coolant about 1 gallon per 100 miles. Radiator hose is soft while idling, no blow by, no leaks under the truck. It is a California truck so it comes with emissions. Whenever I start...
  16. General Discussions
    Hi all, I just picked up a new webasto coolant heater and 7 day timer for my 2020 GMC AT4HD. Has anyone done this install on their 2020+ L5P’s? Looking for any insight on whether I should get it professionally installed or do it myself as a DIYer. The cost of labour is practically the same...
  17. General Discussions
    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...
  18. 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...
  19. 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...
  20. 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…
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