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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 12-14-2018, 11:14 AM   #1 (permalink)
theZman
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2011 LML thermostats bad?

My coolant temp only gets up to around 150 when itís cold out according to my mini max. Dash gauge never gets close to 210. This pic is from this morning, 45-48 degrees outside, after driving for 20 mins stop and go and 70 mph for about 10 mins straight.




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Old 12-14-2018, 11:51 AM   #2 (permalink)
holmestransfer
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Yeah, Iíd say thatís bad thermostats.


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Old 12-14-2018, 02:38 PM   #3 (permalink)
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Must not be to bad. Normally when you get this code you will notice the temperature is not normal in the interior.
DTC P0128 is designed to detect for a stuck open thermostat
Google “Duramax P0128” will explain this code.
Since yours is a 2011 if you haven’t done a coolant flush yet this would be a good time if your going to put in new thermostats.
If you plan on doing this yourself there is a DIY on here also lots of YouTube videos.

Last edited by Rvn4me; 12-14-2018 at 02:51 PM.
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Old 12-14-2018, 07:54 PM   #4 (permalink)
redwngr
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My 2011 LML would always have been fully warmed under the conditions you described.

I'd be checking/changing thermostats
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Old 12-14-2018, 08:12 PM   #5 (permalink)
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Picked up a set of thermostats today, gonna change em out tomorrow


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Old 12-14-2018, 09:42 PM   #6 (permalink)
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Quote:
Originally Posted by theZman View Post
Picked up a set of thermostats today, gonna change em out tomorrow
The rear thermostat has 2 vent valves. Install with the vent valves towards the rear of engine.

Last edited by G2GBY; 12-14-2018 at 09:42 PM.
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Old 12-16-2018, 02:08 PM   #7 (permalink)
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New thermostats fixed it! Back up to 181-190 on the gauge. The old ones didnít look bad though.




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Old 12-16-2018, 05:57 PM   #8 (permalink)
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They usually never look bad, they just fail.
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Old 12-16-2018, 07:10 PM   #9 (permalink)
redwngr
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If you are curious, or for sh*ts a giggles, you can suspend them in a pot of water, with an appropriate oven/meat thermometer, and see which one (or both) are not working correctly.

The temp printed on it is the temp at which it should start to open (=/- a few degrees. Fully open at about 10 to 12C deg above that.
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Last edited by OkDually; 12-16-2018 at 07:32 PM. Reason: lv
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Old 12-17-2018, 08:30 AM   #10 (permalink)
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Quote:
Originally Posted by redwngr View Post
If you are curious, or for sh*ts a giggles, you can suspend them in a pot of water, with an appropriate oven/meat thermometer, and see which one (or both) are not working correctly.

The temp printed on it is the temp at which it should start to open (=/- a few degrees. Fully open at about 10 to 12C deg above that.
Thanks for posting this.
This is also a good test for new ones. I’ve seen someone do this test for new ones and for his choice to the ones he wanted to use. Just because there New doesn’t mean the all don’t open up at the same temp.


Last edited by Rvn4me; 12-17-2018 at 08:32 AM.
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