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Old 07-09-2018, 04:17 PM   #11 (permalink)
Ron Nielson
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Originally Posted by RailRiderHD View Post
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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Last edited by Ron Nielson; 07-09-2018 at 04:18 PM.
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Old 07-23-2018, 09:21 PM   #12 (permalink)
oldschoolbowtie
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Quote:
Originally Posted by RailRiderHD View Post
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

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Last edited by oldschoolbowtie; 07-23-2018 at 09:22 PM. Reason: sp-1
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