You know, busted...died...
It definitely overheated, the thing that made me pull over was the sound of the engine knocking and boiling. Then after I realized it was the water pump, a few other things made sense.
I had started it up and let it idle for about 20 minutes before I left. When I started it again, it was acting like it had a nearly-dead battery. I tried wiggling the battery cables with no luck, but after some cranking it fired back up (it didn't make much sense to me, but it WAS extremely cold out). Then I noticed a high-pitched squealing noise, but considering all the other noises the truck makes I didn't think much of it, figured it was probably the heater fan or something.
Well, in retrospect, the reason it wouldn't crank was because the water pump was seizing up, and the squealing was the water pump. When I pulled over and popped the hood I could hear coolant boiling and there was steam coming out of the overflow hose, plus that distinct smell. Another odd thing is that the temperature gauge, which has worked, suddenly went from showing the usual nothing to being pegged way off the high end  I think the boiling coolant must've fixed whatever problem it had.
The truck has never even come close to overheating before, though, and then suddenly overheated severely at low speeds in sub-zero temps. I'm worried the head gasket might be blown, but I don't think I'd be able to tell without taking the head off. I don't want to try and crank it and find out the hard way that the cylinders are full of water or something.
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