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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ, LMM & LML engine specific topics.

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Old 03-07-2010, 07:08 PM
wedo04 wedo04 is offline
Join Date: Mar 2010
Posts: 1
Smile Thermostat problems!!!!!!!!!

My 2002 Silverado - DM (189K) started to spit out coolant as soon as I switched it off. People came after me and said "Your truck is leaking"
Observing the temp gauge jerking up to above 100C then down to 75 and back up again I decided to change the two Thermostats.
A piece of cake! (Well done DURAMAX Engineers!) A 2 hour job,drain, refit, refill, run up to temp and blead air.
COST $62.00CAN
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Old 03-08-2010, 01:11 PM
Kennedy Kennedy is offline
Long Distance Crew Chief for BMDMAX
Join Date: Mar 2000
Location: Loyal WI US
Posts: 10,589

Boy I hope that's all it is, but it's hard to believe that it's fixed that simply. If it was summer and you were running hot enough to boil I might buy that.
Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ

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Old 03-12-2010, 10:52 AM
More Power's Avatar
More Power More Power is offline
Join Date: Feb 2000
Location: Big Sky Country
Posts: 10,205

I agree with Kennedy. GM used two thermostats, in part, to provide redundancy. Unfortunately, most cooling system over-pressure or coolant loss problems are due to either injector cup seals (only the LB7) or head gasket leaks.

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Old 03-21-2010, 11:52 PM
UndergroundDmax UndergroundDmax is offline
Join Date: Mar 2010
Posts: 5

I never heard of a truck doing what you described. How is it running now?
[CENTER][FONT=Comic Sans MS][COLOR=red]04' Dmax [EMAIL="11.44@121"]11.44@121[/EMAIL] on #2 only 791rwhp[/COLOR][/FONT][/CENTER]
[CENTER][FONT=Comic Sans MS][COLOR=#ff0000]3rd place super street NHRDA AZ nationals 3-6-10[/COLOR][/FONT][/CENTER]
[CENTER][FONT=Comic Sans MS][COLOR=#ff0000]1st place modified Dyno AZ nationals 3-6-10[/COLOR][/FONT][/CENTER]
[CENTER][FONT=Comic Sans MS][COLOR=#ff0000]1st place Diesel Wars drags 3-20-10[/COLOR][/FONT][/CENTER]
[CENTER]^^11sec video^^[/CENTER]
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