2007 cummins 6.7 liter· Registered
mine does it too. I never looked into it. I was thinking it's the fan coming to a stop. I do know that they designed the pulleys so the belt wouldn't slip when you shut it off. I didn't think there was anything wrong with that. But now we get to listen to three clicking sounds instead. I liked the chirping sound better. I think its kind of a cummins thing. I don't think any other diesel does that.