Operating Temp - Chevy and GMC Duramax Diesel Forum
06-07.5 LBZ & LLY 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 Ect

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Old 11-30-2012, 06:13 PM   eBay Motors  #1 (permalink)
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Operating Temp

Got 2 very similar trucks:
Mine is 06 GMC SLT CCSB 4wd
Nephew's is 06 Chevy LT CCSB 4wd

mine runs 180 on the head. (interstate no load empty)
his runs 210 (interstate no load empty)

Get off the interstate and idle....his goes to 180.
Get off the interstate and idle....mine stays at 180.

His truck up until about a week ago held 180 all the time.

Going to pull his thermostats and see if that makes a difference first. If not, will chase down a heat gun to see if there really is a diff in temp and not just normal gage differential.

Any other obvious things to check? Performance on both trucks seems equal.
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Old 11-30-2012, 06:18 PM   eBay Motors  #2 (permalink)
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How are you reading temps on each truck?
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Old 11-30-2012, 08:23 PM   eBay Motors  #3 (permalink)
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How are you reading temps on each truck?
factory gage
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Old 11-30-2012, 08:57 PM   eBay Motors  #4 (permalink)
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Put a monitoring it,the factory gauge lies
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Old 12-01-2012, 09:21 AM   eBay Motors  #5 (permalink)
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Does his truck have a cat on it? I know when my 06 had a cat on it, it alway ran at 210. Then when I finally took it off it started running cooler at 180. I have no clue why my 06 even had a cat on it. Guess it just depends on where it was built.
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Old 12-01-2012, 09:44 AM   eBay Motors  #6 (permalink)
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Thermostats are 180* and 185*, your truck is running good.
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Old 12-02-2012, 09:13 AM   eBay Motors  #7 (permalink)
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Replaced both thermostats. No change. Truck is clearly not overheating. But the gage rolls up to 210 on the interstate and slides back down if you throttle back to 60 mph or so.

Remember....this is a recent change from normal..... truck previously remained at 180 (on the factory gage) at all times.

I understand that so long as it is not overheating, it is not a problem per se.... Just an annoyance. Think like an airplane pilot. Although temps are within specs...there is a change.
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Old 12-02-2012, 09:25 AM   eBay Motors  #8 (permalink)
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Mine runs at 181 most of the time thru my insight, my factory gauge reads 5 degrees hotter
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Old 12-02-2012, 09:37 AM   eBay Motors  #9 (permalink)
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My insight reads 165 here lately, factory gauge reads normal temp
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Old 12-02-2012, 09:42 AM   eBay Motors  #10 (permalink)
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Didn't sound like a thermostat to begin with, I would start by using an electronic gauge or scanner, then go from there. Our gauges aren't that accurate.

If you do have that difference I would start by cleaning the radiator stack.

Are both trucks stock?


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