Normal Operating Temperature? - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 16 (permalink) Old 03-06-2012, 02:01 PM Thread Starter
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Normal Operating Temperature?

Hello,

I've got a new to me LB7 and I think that the temperature is a little low. On all of my other vehicles (mostly GM), operating temp is 210, however I cant get the Duramax above 170 (according to the gauge it is 180). I took the reading via my OBDII reader, it is 170-172F.

I thought it was because I have no winter front and it has been around or below freezing. Today it was 60F and it was still the same temperature.

The reason for my concern is this. I produce a lot of blue smoke at idle...injectors you might say. I took it to Merchant and another place by my house, and both say that the readings are very good. None are +- 1.5. They said that it is blue at idle because the engine is not hot enough to burn all of the diesel.

Any suggestions?

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post #2 of 16 (permalink) Old 03-06-2012, 07:31 PM
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My 04 runs this cool also. In town it is 160-170 all the time. If I drive it a little bit harder than normal it will warm up or if I get on the highway at 65-70 it will warm up. Not sure what the low side thermostat is but I would bet its a 165-170 since this is where they like to run. I have a few friends with lb7s and they all run as cool.
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post #3 of 16 (permalink) Old 03-06-2012, 07:54 PM
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Normal temp

Jason
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post #4 of 16 (permalink) Old 03-06-2012, 08:06 PM
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Yeah mine runs around 160 to 170.

2003 silverado 2500hd cc 4x4 LT, leveling kit, 285/75/16 terra grapplers, banks monster 5" exhaust, edge juice w/attitude, 5000k hids, led tail lights
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post #5 of 16 (permalink) Old 03-07-2012, 05:46 AM Thread Starter
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Then I'm hoping the injectors are not bad. The readings are very normal after all...any ideas for why it smokes?

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2011 GMC 2500 CCSB LML - Sold
2003 GMC 2500 ECLB LB7 - Sold
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post #6 of 16 (permalink) Old 03-07-2012, 06:22 AM
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Mine runs the same. The only time the temp gets up is either when pulling a trailer or in the summer with a/c on it will hit 210

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post #7 of 16 (permalink) Old 03-07-2012, 08:25 AM
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Mine was running around that temp so I replaced the thermostats. The low one is 180 I think. It does run right at 180 now without the winter front and 186 with the winter front (temps read with Edge Insight). It does take highway driving to get it warmed up. The higher temp makes a huge difference in heater output. It does take forever to warm up just idling.

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post #8 of 16 (permalink) Old 03-07-2012, 08:26 AM Thread Starter
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Quote:
Originally Posted by MLAAWDMAX View Post
Mine was running around that temp so I replaced the thermostats. The low one is 180 I think. It does run right at 180 now without the winter front and 186 with the winter front (temps read with Edge Insight). It does take highway driving to get it warmed up. The higher temp makes a huge difference in heater output. It does take forever to warm up just idling.
Thats exactly what I'm having an issue for. It does take forever to warm up idling (30+ minutes). Even driving, the heat output is quite low.

Do you know how much the thermostats are? Where to get them? How to replace them?

Thanks!

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post #9 of 16 (permalink) Old 03-07-2012, 08:38 AM
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Mine now takes about 5 miles at highway speeds to come up to full temp. It still won't warm up a whole lot just idling, but it is much better with the new thermostats and will now put out heat. I got my thermostats at the local parts store in a kit that had both thermostats and the rubber gaskets. Merchant also has them. They are very easy to change. I removed the bolts that hold down the housing and the bolt that holds the radiator hose pipe at the driver side head. DO NOT DROP THE BOLTS. I have never had so much trouble trying to find a dropped bolt in my life (let alone reaching it). I did not disconnect the housing from the metal radiator pipe. Each thermostat has a rubber seal on it and no gaskets to scrape. Make sure to get the right coolant for your truck.

2002 Chevy 2500HD CC SB 137k miles
reprogrammed ECM by ATP Trucks (Edge Insight)
4" ss MBRP XP turbo back exhaust
Airdog II 165 (with cat filter) & Nictane adapter with 1 micron filter
Stock trans.
New Injectors @ 137k
Previous owner had injectors done @ 60k and 85K
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post #10 of 16 (permalink) Old 03-07-2012, 08:41 AM
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Your truck is never going to warm up fully just idiling. In winter highest mine ever goes is like 181. That's driving on highway


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sold 04.5 lly
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