I have a '93 Pontiac Grand Am that I "inherited" by default.  It has
not really been taken care of - unfortunately I do not have alot right
now that I can put into it.  Today it overheated and actually shut
down.  It did restart right away but was overheated.  I let it sit for
several hours and then added coolant and water (though there still
appeared to be some in there) and drove another mile home.  It did not
overheat (it was literally 1 mile) but there was no heat whatsoever
and when I turned off the car it sounded like the coolant resevoir was
boiling.  Any suggestions?

Thank you.