Thermostat replacement - Diesel Bombers

Chevy/GMC Duramax 04.5-05 LLY Discussion of Chevy and GMC Trucks with LLY Duramax Turbo Diesel Engines

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Old 01-12-2011, 12:18 PM
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Join Date: Dec 2010
Location: Indiana
Posts: 6
Default Thermostat replacement

Does anybody know where exactly the thermostats are at and if so how do you go about replacing them? I am going to try to do that tmrw and I need some help.
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Old 01-20-2011, 09:26 PM
2500HeavyDuty's Avatar
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Join Date: Oct 2007
Location: Houston, Tx
Posts: 14,883

right on the top front center of the engine, follow the top radiator hose to the cast piece of metal that sits in between the ac compressor and the alternator, its held down by 4 12mm bolts with a bleeder screw on the top of it
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Old 01-26-2011, 06:47 PM
Join Date: Jan 2011
Location: upstate N.Y.
Posts: 1

have an 05 lly duramax was told you can download a program for my laptop to power tune my truck already have adapter from laptop to obdII.
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Old 01-26-2011, 08:26 PM
BriteWhiteRam's Avatar
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Join Date: Mar 2009
Location: Alberta, Canada
Posts: 1,070

there is EFI live and HP tuners, but you have to buy their hardware in order to modify the ECM tuning
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