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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 01-30-2018, 03:37 PM   #1 (permalink)
dk24291
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Duramax thermostats

Need to replace the thermostats on my 2006 LBZ. Can any of y'all point me in the right direction on which kind to get and where..? I'm guessing Ac Delco brand, unless y'all have another brand that works as well?

Found these but I don't know about them..

https://www.xtremediesel.com/mishimo...gaAqb7EALw_wcB

I just want the plain jane ones.

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Old 01-30-2018, 04:04 PM   #2 (permalink)
DuramaxEric
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You can't go wrong with Merchant Automotive.

https://www.merchant-automotive.com

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Old 01-30-2018, 05:18 PM   #3 (permalink)
donny01tj
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Ordered mine through gmpartsdirect.com

97241129 & 97241130
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Old 01-30-2018, 06:46 PM   #4 (permalink)
306LBZ
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I got mine from merchant great guys to deal with each and Everytime. (I'm in no way shape or form affiliated with them just a satisfied customer). Buy I will probably try low temp thermostats next time, truck still never seems to get 110% fully hot.
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Last edited by 306LBZ; 01-30-2018 at 06:46 PM.
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Old 01-30-2018, 07:39 PM   #5 (permalink)
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Quote:
Originally Posted by DuramaxEric View Post
You can't go wrong with Merchant Automotive.
https://www.merchant-automotive.com
I live neer them.
There just a high price internet seller. 116.95
https://www.merchant-automotive.com/...-Kit-2001.aspx
GM Part :97241129 ACDelco 131-163 $30.79
G M Part :97241130 ACDelco 131-131 $26.79 Total $57.58

Last edited by G2GBY; 01-30-2018 at 07:59 PM.
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Old 01-30-2018, 09:45 PM   #6 (permalink)
dk24291
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Thanks guys. From my research, it says the thermostats should be 185 degrees, but from the limited amount I do know about these trucks, aren't they supposed to run at 210? (Please excuse my ignorance if what I said wasn't right.. Lol)

Also, found these on Rock Auto for $17.. Something doesn't seem right considering they are Ac Delco brand and cheaper than the off brand's I've looked at.. Second opinions? They are the ones for $17. 12T99D and 12T100D

2006 CHEVROLET SILVERADO 2500 6.6L V8 DIESEL Turbocharged Thermostat | RockAuto
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Last edited by dk24291; 01-30-2018 at 09:46 PM.
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Old 01-31-2018, 10:14 AM   #7 (permalink)
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Quote:
Originally Posted by dk24291 View Post
Thanks guys. From my research, it says the thermostats should be 185 degrees, but from the limited amount I do know about these trucks, aren't they supposed to run at 210? (Please excuse my ignorance if what I said wasn't right.. Lol)

Also, found these on Rock Auto for $17.. Something doesn't seem right considering they are Ac Delco brand and cheaper than the off brand's I've looked at.. Second opinions? They are the ones for $17. 12T99D and 12T100D

2006 CHEVROLET SILVERADO 2500 6.6L V8 DIESEL Turbocharged Thermostat | RockAuto
Look at the Alternate Part numbers. They don’t correlate with GM Part :97241129, GM Part :97241130
DO NOT BUY. If you need extra $$$$ PM me.
ACDelco 12T99D Alternate/OEM Part Number(s): 19137277
ACDelco 12T100D Alternate/OEM Part Number(s): 19137278

Cooling Cycle (6.6L Diesel Engine)

Coolant is drawn from the radiator outlet and into the water pump inlet by the water pump. The coolant flows to the heater core while the engine is running. This provides the passenger compartment with heat and defrost.
Coolant is then pumped through the water pump outlet and through the coolant pipe to the engine oil cooler. The coolant flows around the oil cooler element and to the rear engine cover. The rear engine cover distributes the coolant flow to both banks of the engine block. In the engine block, the coolant circulates through the water jackets surrounding the cylinders where it absorbs heat.
The coolant is then forced through the cylinder head gasket openings and into the cylinder heads. In the cylinder heads, the coolant flows through the water jackets surrounding the combustion chambers and valve seats, where it absorbs additional heat.
Coolant is also directed to the turbocharger. There it circulates through passages in the center housing. During engine warm-up cycle the bypass valve located in the turbocharger inlet hose at the outlet pipe prevents coolant flow. During normal operating temperatures, the coolant assists in keeping the turbocharger cool.
From the cylinder heads, the coolant flows to the thermostats. The coolant flows from the thermostat housing to the water pump through the bypass pipe until the enginereaches 85C (185F).
Operation of the cooling system requires proper functioning of all cooling system components. The cooling system consists of the following components:

Thermostats (6.6L Diesel Engine)

The thermostats are coolant flow control components. The purpose of the thermostats are to regulate the correct operating temperature of the engine. The thermostats utilizes a temperature sensitive wax-pellet element. The element connects to a valve through a piston. When the element is heated, it expands and exerts pressure against a rubber piston. This pressure forces the valve to open. As the element is cooled, it contracts. This contraction allows a spring to push the valve closed.
The 6.6L diesel engine requires two thermostats for correct coolant flow. The front thermostat is a dual purpose thermostat. The front thermostat controls the coolant flow to the bypass port and to the water outlet. The rear thermostat only controls the coolant flow to the water outlet.
When the coolant temperature is below the rated thermostat opening temperature, the front thermostat valve remains closed to the water outlet and is opened to the bypass port. The bottom portion of the thermostat is raised off of the bypass port while at the same time the top portion closes the coolant flow to the water outlet. The rear thermostat also is closed to the water outlet during engine warm-up. This prevents circulation of the coolant to the radiator and allows the engine to warm up quickly. After the coolant temperature reaches 82C (180F) the front thermostat primary valve opening temperature, the front thermostat primary valve will start to open. The coolant is then allowed to circulate through the thermostat to the radiator where the engine heat is dissipated to the atmosphere. As the engine coolant reaches 85C (185F) and more coolant demand is required the front thermostat secondary valve begins to close the bypass port and the rear thermostat begins to open coolant flow to the water outlet. The thermostats will continue to control the coolant flow by opening and closing. The front thermostat will be fully open when the coolant temperature reaches 95C (203F) the rear thermostat will be fully open when the coolant temperature reaches 100C (212F). The thermostat also provides a restriction in the cooling system, even after the it has opened. This restriction creates a pressure difference which prevents cavitation at the water pump and forces coolant to circulate through the engine block

Engine Oil Cooler (6.6L Diesel Engine)

The engine oil cooler is a heat exchanger. The engine oil cooler is mounted to the left lower corner of the engine. The oil filter is attached to the oil cooler housing. The engine coolant flows around the oil cooler element. The oil cooler element is a series of plates. The engine oil temperature is regulated by the temperature of the engine coolant that surrounds the oil cooler as the engine oil passes through the cooler.
The engine oil pump, pumps the oil through the engine oil feed line to the oil cooler. The oil then flows down through the cooler while the engine coolant absorbs heat from the oil. The oil is then pumped through the oil return line, to the oil filter, then to the main engine oil passage.

Last edited by Rvn4me; 01-31-2018 at 10:27 AM.
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Old 01-31-2018, 12:16 PM   #8 (permalink)
dk24291
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^^^ so you are saying the ones in the link are the correct ones? 12T99D and 12T100D arent the numbers I found for the LBZ thermostats

The part number I found is here http://www.duramaxhub.com/duramax-maintenance.html
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Last edited by dk24291; 01-31-2018 at 12:18 PM.
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Old 01-31-2018, 12:27 PM   #9 (permalink)
dk24291
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And do I need this gasket or just re use the one that's already on it? https://www.google.com/search?safe=s...iw=360&bih=567

I apologise for all the questions. I just want to get it right the first time
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Old 01-31-2018, 02:34 PM   #10 (permalink)
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You do not need that gasket. The ac delco #s listed are the same part as the GM #s, just packaged differently. Do not know where G2GBY came up with the AC delco #s131-163 and 131-131, no reference for them.

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