temp gauge

I have a question about a temperature gauge. The car that I am driving
is a 1993 mercury topaz. I have noticed that my temp gauge stays in
the normal area, but in the higher ****tion of it. The car has anti-
freeze, no leaks as far as I could tell, but occasionally I get a
smell of anti-freeze when the heater is on, but very occasionally. But
on some occasions, the temperature gauge stays in the lower part of
the normal area. In other words, the needle floats. So the question I
want to ask is this, what is the normal area the needle needs to be
at? Or perhaps this is something that I should not worry much about?
Thanks for the info...Gary