mine was same way, in winter with stop and go traffic, my temps went over 100C. with the 83C thermostat - it may still do that but it will take a bit longer. i also have the resistive cooling mod installed which just stops it before it goes over 100C...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"