Just pulled a tough hill, towing my about 17k 5ver, pushing it hard to get past a wide load truck and the turbo went to about 20,000 or so... pretty loud wind up noise that is new to me. Wondered if ...
Agree, think it was the fan. I'm sure the heat went up cuz it was working hard. Was paying more attention to the hill and traffic. I was more used to my ISL 370 running behind me in the motor home so a bit new. The last diesel I had wasn't turbo equiped, nor is my farm tractor...