90 cooling system question........

[LEMONHEAD <br00206@bingsuns.cc.binghamton.edu>]

Hi all.

Just replaced the temperature sensor in my '88 90.  Works fine.  Another 
question, however, has surfaced.  

OK.....the ambient air temperature around here has been around 0 to 10 
degrees F.  Now...I've noticed that my temperature gauge hovers slightly 
above the "C" mark when driving at highway speeds.  Around town, The needle 
slightly rises to about 1/3.  Is this normal for my car?  I would say 
that the thermostat is defective; I'm getting good, toasty heat, however, 
from my heater.  

Any input will be appreciated. ;)

Have a good one - Chris