temperature fluctuations

[win]

I have a 2007 5.9 cummins with 107,000 k
Noticed as i was driving today temp was higher than usual around 90 -95 c.
Im wandering if this is normal, never noticed this before. I think the problem maybe the thermostat not opening up properly. i don`t have a lot of experience with cooling systems, so any advice
I herd that on these large cooling systems the thermo cycles a lot and the stem scores up and sticks closed.
Thanks

 

[mel.h]

I have a 06 Cummins, that is where mine has run right from new so I wouldn't worry about it. If it climbs up over a 100 when towing in hot weather or a long pull, then you may have a issue. Last year I went over the Coquihalla pulling my holiday trailer, grossing out close to 14,000 lbs & the temp would climb over 95, close to 100, the fan would kick on & cool it back down. if your lugging the engine & the heat is building, normally the trans should shift down to keep a higher rpm which of course helps lower the heat quicker. P.S. If you still have the converter in the exhaust, that keeps the temps up too.

 

[win]

Hey mel.h
These temps were just driving in the city, no load.
When i was pulling the trailer this summer my temps seemed normal like yours, seems weird because i never noticed the temp gauge fluctuate before, would always stay steady on 90c city driving, mel.h i have the turbo back exhaust so should be good there.
Maybe im just paranoid and theirs no issue.
Thanks

 

[mel.h]

I have a AFE stage II air intake, no cat & the full 4" magnaflow exhaust & my temp runs around 95 all day long, even in the city. Keep a eye on it, but for now I personally would not be too worried.