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coolant leak

  1. 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...
  2. 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...
  3. 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...
  4. DIY and Tech discussion
    I just changed my leaking transmission lines on my new body Silverado with only 41k miles. I disconnected the lower radiator hose from the radiator to get more room. The connection is the plastic one, it looks like spines fitting together with a clip. The job is finished and now my connection is...
  5. 911 Problems Forum
    :help I am new to this forum and GMC's. I bought a 2007, 3500 classic with 67K miles on it in May from a Texas dealer. 4 days ago I noticed coolant dripping - from radiator area. I can't pinpoint the leak. Looks like my 100K GM warranty may not cover this. Any info on whether this is a trend...
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