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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 01-06-2015, 11:46 AM   #1 (permalink)
Silverbullet555
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Left coolant in too long

For whatever reason (stupidity) I didn't realize 5 years max life on coolant. Truck is an LBZ with 90K miles on the clock. I knew about the 150K mile max. So mileage wise I should be fine, but I am way over the 5 year max which as I read is somewhat a stretch in and of itself.

I know I can't reverse the damage. Will flush completely this weekend and refill.

Likelihood of damage?

Anything I should be on the lookout for?

I hate the feeling in my stomach when I realize I've been an idiot.

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Old 01-06-2015, 12:29 PM   #2 (permalink)
Tom S.
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Relax. Unless you had a leak in the system that allowed dirt to get in (the major cause of Dex getting gummy), you should be fine. As Nike would say, Just Do It (flush and refill that is!).

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Old 01-06-2015, 01:44 PM   #3 (permalink)
whity06LBZ
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some people dont ever change coolant.... i have to do mine yet since i bough it with 80k miles i dont think it ever got changed...
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Old 01-06-2015, 01:50 PM   #4 (permalink)
90GMC62L
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Take a chill pill my friend, it's more than likely fine. Just change it. Like said, most people don't ever do it and doesn't necessarily cause damage.
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Old 01-06-2015, 01:55 PM   #5 (permalink)
carhauler
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everyone is in agreement look at the condition of what you drain and if it looks good then no worries at all , if it is real dirty/rusty then flush it well and make sure all of the system is good, a T-stat change would not be out of order and use OEM GM stats.
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Old 01-06-2015, 01:57 PM   #6 (permalink)
Silverbullet555
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Thanks for the reassurance. Sometimes I get caught in the doom and gloom of what's coming. Probably because I am working on replacing Subaru head gaskets in our other car.

I'll get it flushed this weekend and then change more frequently going forward.
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Old 01-07-2015, 08:54 AM   #7 (permalink)
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At this point on these older trucks a couple things come to mind, thermostats, changed mine at 38,000 about a year and half ago. Just recently replaced the upper and lower radiator hoses and coolant and before this summer I will have changed all the heater/bypass lines, getting to that little one behind the harmonic balancer is going to be a challenge, item number 37..Next on the parts list is pipe for the lower radiator with a drain plug..

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Old 01-07-2015, 10:20 AM   #8 (permalink)
dwrat
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I just did my 2006 LBZ coolant for the first time and it still looked like new when it came out.
Has 50K miles on it.
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Old 01-07-2015, 11:34 AM   #9 (permalink)
chevman
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70,000 miles on our 05. Flushed once, drained and refilled once and summer of 2014 flushed and new hoses. Overkill ya think?

chevman
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Old 01-07-2015, 02:34 PM   #10 (permalink)
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I NEED to change mine I'm just north of 150k miles, but dammit i can't find the drain valve.....where the hell is the valve guys

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