One day my 6.2 Suburban sounded a little labored, then once I got to the top of the mountain and headed down the other side, it overcooled. That was odd, but I went to work and did my job. After work, I think 'I ought to take a peek'.
A little something shiny caught my eye, and there was the alternator belt completely tied in a big knot around the fan clutch
It took a long time to cut the belt out of the fan, but otherwise nothing was hurt. something to be said for vehicles that don't need much electronics.