The pulley probably didn't come loose, it is made of plastic and probably gave out and vaporized. The same thing happened to me. I found belt and plastic pieces everywhere. Make sure to replace that pulley with a newer style metal one. You mind as well replace the one near the PS pump while you're at it.

 

The new metal 70mm idler puller can be found for $20 (rovahfarm). You can replace the bearing in the 80mm idler pulley (by the PS pump). The bearing is a 6304-2RS. I got a NTN off eBay for $11 shipped.

 

That appears to be the case. I'm replacing it all.

 

dr mordo: "the hardest part is getting the belt back on, which is a bit of a wrestling match"
________________
Yes, it can be, so last time I replaced mine, I thought there must be a better way, so I first of all thought through the whole process of belt replacement carefully, before beginning round one. Here is what I did, without a helper third hand: Put belt on, over everything except the alternator pulley; have the belt sitting just in front of the alternator pulley, with no tension anywhere. Now, with wrench on belt tension er nut, push the wrench while with the other hand fitting the loose belt up and over the alternator pulley. Once on, let up on the wrench on the tension er. Now carefully check everything very carefully, to be certain that belt has remained on all pulleys, etc. and is not riding on rim of any of them. Works for me; piece of cake!!

 

dillhole: "little battery icon lit up. I'm thinking this is an alternator thing, I thought maybe electrical error."
SavannahBuzz: "The RED light comes on at 284 F. Head gaskets can go at 235 F if run long enough."
________________________

The moral of the story is never ever assume anything while driving on. The auto makers put idiot lights on vehicles for a reason; not to ignore them. Ignoring them often risks doing extensive serious costly damage. Need more be said?

 

Well, I really didn't ignore it. I was going to pull over at the next exit and check it out, but then I started to overheat, so I stopped immediately. The icon was illuminated for maybe 10-20 seconds before I stopped.