A tow truck saw my Fiero today. Coming home from the meeting, my temp warning light came on, and the gauge was near the top. So I pulled over as soon as I could and called AAA.
As soon as i got home, I found the problem. The short hose from the engine area to the driver side coolant tube was cut. It seems someone has replaced it before, and used the wrong hose, which was too long, and was buckled towards a metal edge, which eventually cut it.
Tomorrow should be a good enough day to replace it.