I have a 1995 Nissan Altima with over 133,000 miles on it.  I was coming
home one night and the car started smoking within minutes from my home.  I
managed to make it to my house in order to put some water in it- I thought
it was overheating.  When I opened the hood - there was not a lot of smoke
nor was there water blubbling up from the radiator.  The car just cut off.
I took it to the mechanic and he could not find anything wrong with it- he
stated he checked everything and everything was fine.  Could it be a
sensor that burned out and told the car it was overheating?  What's wrong
with her??? Help???