95 Accord overheating,
 

I have a 95 Accord LX with auto trans, 156,000 miles.
A few weeks ago it started exhibiting cooling system problems so I
took it to a family friend who does all kinds of auto repair. He had
it for a few days and told me the radiator had developed a leak so we
replaced that and both hoses and he said there were "corroded"
connections, something to do with radiator fan(s).

The dash temp guage used to go to about 1/4 inch below the mid mark on
the guage and stay there, that was what I believe was normal.

I got home yesterday after some short trips and everything seemed ok.
I even let it idle in the garage until I saw the fans go on.

The problem that started those weeks ago, and now seems to have
returned, is that if I drive to work (approx 20 miles non-stop on the
tollway, 65 mph, after about 10-12 miles the guage starts to creep up
higher than what I believe is normal.
Then, the last mile or so coming off the toll way and into the parking
lot, the guage continues to rise slowly until I turn the car off, but
not quite getting up the half way mark.

Could this be just a thermostat? It's driving me crazy!