My 1992 190E 2.3 seems to be running too hot.

When I first start it, or when I'm trying a constant speed such as on the highway, it's usually close to 80 or 85 celcius.

However, when I start to go through traffic, or stop signs, or red lights, and I stop and go even a little bit, it starts to run at 95 to 105 celcius.

Is this normal? If not, what should I do?