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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I'm leaning towards the fan kicking in. Mine has done it and it sounds like a jet taking off. if you were pulling a long hill, my guess is the engine finally got warm enough to need it. What was your engine temp?
