Temperature behaviour 2.2 16V

Hello, I would like to tell you again some zm temperature behavior of my 2.2 16V. If it is cold, the temperature goes up to almost 100 degrees in the operation, then it goes down to 90. Since the pointer lingers for a few minutes, then the temperature starts to rise at some point to almost 100 degrees and then slowly commutes back and forth between 92 and 98 degrees. I can’t see that this is related to some kind of driving behavior or speed. At -6 degrees outside temperature. I have the impression that this is not normal. Anyway, I know this from my previous omis differently. Because the pointer was always quite constant at about 90 degrees. My first idea was, of course, that the thermostat was not working properly. I changed it, but there was no change. I also bridged the plug at the top temperature switch of the cooler, the fan is running. 1. Question: How does the temperature behave with your n 2.2 16V’s ? 2. Question: What could lead to such a temperature behaviour? Which components could still be checked? 3. Question: From when does the temperature switch have to switch?