ISL too hot, part II

[Navy Flier]

Thought that I would close the circle for the benefit of others and add a little to the knowledge base at the same time.
Took the coach to the Freightliner dealer on Tuesday. On the way in, while monitoring the digital display, the temp came up to 180 and stayed there until I had to stop at a railroad crossing close to the dealership. At that point the temp started to climb reaching 215 by the time I shut down at the Freightliner shop. Now I was suspecting the fan even though it was running on my Saturday test run. The shop folks had the same thought. Turns out the fan clutch hub was coming apart and was unltimately going to take the clutch with it. The fan was working intermittently. One thing I have noticed with this coach is that the air flow from the fan is significant. I don't know if that is unique to this engine but you can sure tell when the fan is on.
While I had the coach in for work I had them check why the transmission temp gauge was not working. Seems the factory failed to install part of the wiring!!! Isn't that interesting. Also the wiring required is on national backorder.
Thanks to all for the suggestions.

[Navy Flier]

Thought that I would close the circle for the benefit of others and add a little to the knowledge base at the same time.
Took the coach to the Freightliner dealer on Tuesday. On the way in, while monitoring the digital display, the temp came up to 180 and stayed there until I had to stop at a railroad crossing close to the dealership. At that point the temp started to climb reaching 215 by the time I shut down at the Freightliner shop. Now I was suspecting the fan even though it was running on my Saturday test run. The shop folks had the same thought. Turns out the fan clutch hub was coming apart and was unltimately going to take the clutch with it. The fan was working intermittently. One thing I have noticed with this coach is that the air flow from the fan is significant. I don't know if that is unique to this engine but you can sure tell when the fan is on.
While I had the coach in for work I had them check why the transmission temp gauge was not working. Seems the factory failed to install part of the wiring!!! Isn't that interesting. Also the wiring required is on national backorder.
Thanks to all for the suggestions.

[GaryKD]

Thanks for closing this with us. It is good to know the final answer.