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Thread: DIY _ thermostat Replacement Reply to Thread
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  Topic Review (Newest First)
01-04-2020 07:42 AM
SoCalMike The easiest way for me to change the thermostats was to remove the bracket on the top of the thermostat housing, remove the oil fill tube and just remove the thermostat housing. Didn't need to remove anything else on my LBZ. Just remember to get new orings for the thermostat housing to upper radiator pipe and oil fill tube. I always change the oring for the thermostat housing to radiator pipe when doing this job. Use a little dielectric grease on the oring so you done roll or damage it when putting it back together. You don't have to always replace the oil tube oring. I just keep one on hand just in case the original one is bad when removing / installing the oil tube back in.

After the install of the thermostats, I install the housing back on and torque the bolts leaving the thermostat bracket off. Install the oil fill tube back on. The do the bleed process. With the thermostat bracket on you can't get to the thermostat bleed screw. And when your bleeding the air out, you don't want to get coolant in your oil so that is why I reinstall the oil fill tube.
10-28-2019 03:09 AM
Originally Posted by Hook'em_Horns! View Post
YEP My damn puter never has been able to spell or count korectly
10-27-2019 09:19 AM
Hook'em_Horns! 180/185
10-27-2019 04:06 AM
Originally Posted by Marauderer View Post
Premis, thanks for the write up. I notice mine not coming to operating temp anymore. And it comes up slowly.

What is the stock thermostat temps??

180 and 188, replace them both at the same time.

One is long the other is short. Note which was in which location and replace the same. It is foolproof though, the long one will not fit in the short location.
10-26-2019 04:47 PM
Jaredo See attached pictures.
* Had to remove these brackets so we could pull the thermostat cover off.
* thermostat cover pulled off.
* I also pulled the oil fill tube out. Not sure how you can pull the thermostat cover off without doing that!

Thermostats Part number from O’Reilleys is #44748
Hope this helps anyone. This truck is a 2007.5 Chevy Silverado 2500 HD duramax 6.6 LMM
12-28-2017 07:39 PM
SportsFans 2006 LBZ not getting to operating temp...thanks Bro!!
11-19-2017 08:11 AM
chrisvelardi What thermostats did you use ? Part #'s ? I have to do my 2006 LBZ getting a P0128 code on mine
08-24-2016 10:49 PM
Miguelesp Great write up.

Thank you sir.
06-21-2015 12:53 PM
hedgehog sub'd
12-20-2014 03:51 PM
1DurtyMax Thanks a lot! This was great to use on my lbz. Only difference was the oil filler neck had to be removed ( only 3 bolts) and no drain on my radiator so I pumped 2 gallons out of the reservoir box into a couple jugs and didn't lose any coolant. Thanks again
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