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

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  #1  
Old 03-07-2010, 06:08 PM
wedo04 wedo04 is offline
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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.
RUNS LIKE NEW / NO LEAK's / NIECLY CONTROLS TEMP AROUND 90C
COST $62.00CAN
Great,ehhhhhhhhh
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  #2  
Old 03-08-2010, 12:11 PM
Kennedy Kennedy is offline
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Location: Loyal WI US
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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.
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  #3  
Old 03-12-2010, 09:52 AM
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More Power More Power is offline
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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.

Jim
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  #4  
Old 03-21-2010, 11:52 PM
UndergroundDmax UndergroundDmax is offline
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I never heard of a truck doing what you described. How is it running now?
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[CENTER][FONT=Comic Sans MS][COLOR=red]04' Dmax [EMAIL="11.44@121"]11.44@121[/EMAIL] on #2 only 791rwhp[/COLOR][/FONT][/CENTER]
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