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My 2008 sierra 2500 duramax I have an edge cts2 monitor when I am not towing shows 180-200 ect on average. Towing my 30 foot travel trailer we just got it is showing 213-220 average and if pulling a steep grade got up to 230. I am reading and seeing on some sites this is normal for a duramax but its new to me. I also dont feel like I have heard the fan kick on yet. Just making sure these temps are normal I never reached 3/4 on factory gauge nor had a message on DIC
 

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Anyone? I had the clutch fan changes and coolant flushed and it was even worse on the tow home got up to 233 and i let off because i was scared of overheating? Is this normal? I thought fan kicked on at 228
 

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I would start by cleaning the cooling stack....
 

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That's hotter than I ever saw my LLY. But I had the secondary cooling system from engineer837. May have been that hot before I got that and the ScanGauge. Haven't really run enough miles on the 18 to see, but so far 203 is it. But I have not made the long pull on a hot day yet! Fan on the 05 kicked on high about 213. !0 year old truck probably needs the radiator pulled and cleaned, or even replaced.
 

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That seems normal to me. I just got back from a camping trip up in the mountains, with my 30’ toy hauler last week. I saw 230° on my CTS and the fan was on.
 

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Ok thanks for the replies. I cleaned the cooling stack today ( atleast partially) after we got home from the trip. Also got a nice surprise as when i opened the hood apparently the dealership i had change the clutch fan didnt get the ecm mounted back right on the fan housing and it was hanging down rubbing on my fan belt. Didnt appear it did any damage luckily. I also cleaned out the air filter which a friend suggested. Hopefully this helps but I wont know until we take the TT back out. It pulled it like it wasnt even there without the heat issue I was impressed.
 

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Thinking I might have a deeper issue. Now my truck is only running around 160 ect coming home tonight from work. After doing some research I am thinking my thermostats need replaced. Could this be the cause of my random ect increases also?
 

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Starting to really dislike this truck and think I made a poor decision. Now i have a hood leak coming from the front of truck its either power steering or coolant this thing is a basket case.
 

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Starting to really dislike this truck and think I made a poor decision. Now i have a hood leak coming from the front of truck its either power steering or coolant this thing is a basket case.
Check your transmission cooler lines, they are know to leak at the area it goes from rubber to metal.
As for towing temps, my fan kicks on around 230-235 and you know 100% when it turns on unless your blasting your radio.
 

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Also, when towing hills down shift so your around 2300-2700 rpms.
Don't lug your motor or it gets hot.
 

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Anyone? I had the clutch fan changes and coolant flushed and it was even worse on the tow home got up to 233 and i let off because i was scared of overheating? Is this normal? I thought fan kicked on at 228
One thing you need to understand is that the lockup on the fan clutch is not DIRECTLY tied to the coolant temperature. There is no direct/electrical link between the two. When the fan clutch gets hot enough, it will lock up, but not until then. Cleaning the cooling stack, particularly that area directly in front of the fan clutch, so that air passing thru to the fan clutch is the best way for the air to hit your fan clutch at ~the same temp as the radiator.

I just came home to Kansas from a trip to the mountains of Colorado with the Arctic Fox in tow. I-70 goes up to 11,158 at the Eisenhower Tunnel and my temp gauge was at about the 2PM position for part of that uphill pull. I reduced speed from 60 to 50. Fan did turn on, engine temps came down to 12PM position on the temp gauge. I'd tell you what temp my CTS said, but it burned up about a month ago.
 

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Anyone? I had the clutch fan changes and coolant flushed and it was even worse on the tow home got up to 233 and i let off because i was scared of overheating? Is this normal? I thought fan kicked on at 228
This is why GM built a "buffer" into the factory temp indication on dash. The truck is a monster and when towing some variation in temperature is normal. I watched the CTS 2 go from 205 to 225 and factory needle didn't move but say a millimeter or so. 230 on a grade or running hard aint gonna hurt as long as it comes back when you let off.

The clutch fan is not a precision instrumented piece of gear.

The other issue is there is a lot of hot coolant in the ole Duramax so it takes a minute to turn it back

when its cool make sure its got all the air vented out and is full

I am not thinking you have an issue especially if ambient temps are warm and you run hard or have a tune

make sure the stack is clean:2cents::2cents:
 
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