High turbo noise
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 ...
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It is the fan; they ramp up quite quickly and run for a bit even after cresting a hill. It brings the temperature down very quickly, though! Enjoy your new truck; we love ours!
