Your coolant temperature behavior sounds perfectly normal to me. There is nothing to fix.

Is the fan clutch electromagetic of themostatic. My '84 2.3 had an electromagnetic clutch, but I though later 2.3s have a themo-clutch like my 2.6.

I assume your car also has an auxillary electric fan.

On my 2.6 the mechanically driven fan's thermo clutch tightens at about 100C, so in stop and go traffic it will get up to 100. In hot weather stop and go traffic it can get up to 105C, which is where my two auxillary electric fans engage at high speed. This rapidly cools the engine to about 100 where they disengage.

The electrics also engage at low speed based on A/C demand. The car will actually run cooler in traffic with the A/C on since this operates the electrics enough to keep the temperature from going over about 100C.

Duke