A 1997 Cavalier uses a 15 amp fuse for the cigarette lighter / horn. The fuse box door has a diagram that will show you where the fuse belongs and the proper amperage.
It helps to know if you have a 2.2L or a 2.4L. I dont know how to do it on a 2.4L because I've never done it, but on the 2.2, here goes:
You will need a long crowbar to move the tension pulley. Take a long pulley and wedge it in behind the tension pulley. The pulley moves towards the front of the car. If you are standing on the passenger side of your car looking at your engine, the pulley will be on your left (towards the firewall) about halfway down. It should be right below the power steering pulley. You will see a big round thing with an arm reaching off of it to a smaller pulley that the serpentine belt runs around. Stick the crowbar behind the tension pulley and move the pulley forward, loosening the tension on the serpentine belt. While holding the tension pulley forward, pull the belt off of the alternator. Let the tension pulley go slowly, dont let it spring back. It could damage more things. Now, just unbolt the three bolts on the alternator and unbolt the power cable, and the connector as well and wiggle the alternator out.
Leak in exhaust system perhaps exhaust manifold being sucked in through air intake (grid at lower end of windshield)
Low coolant? Bad thermostat? System airbound? Water pump not circulating coolant? Temperature control cable not adjusted properly?