306 1.6 automatic overheating problem

Let me state my problem as follows, while my vehicle is idling, it runs steadily around 95-97 degrees and even in this case, the fan runs up to 90 degrees at low speed (i.e. continuous fan is running), it approaches 90 degrees when descending depending on the length of the slope, once on a long slope to 85 degrees fell as much, vice versa 2000 dd and over, or when overtaking uphill etc. Even with little pressure, the temperature hand reaches up to 105-110 degrees within 10 seconds, and it does not come down unless I pull my feet out of the gas. When the car relaxes, it travels in the range of 95-105 degrees again, and when all this is happening, when it starts to touch 110 degrees and even a little redline, I parked the car directly in the middle of the slope, I immediately ran to the hood, but there is neither a water boil, nor a different situation. When I opened it, I saw that my car dropped to 100 degrees and I opened the radiator cap, but there was neither water thrown nor boiling water. I showed it to a few services and different masters, even in the original booklet it says that it is normal up to 110 degrees, but I used the car in fear. I did not get into a car that changed degrees so fast, an average of 10 seconds. reacts well. While there was no thermostat, it was doing the same between 70-90, I had the thermostat installed, they changed the green sensor, the fan is working on the first stage, but I have not witnessed the second stage is working. When I turn the ignition off and on, it shows an average of 5 degrees, sometimes 7-8 degrees different from the one that normally shows, and after a while it rises to the same degrees. I have clean oil, clean antifreeze, rust, oil, foaming flan, no problem, I have no problem in the traction such as falling fuel excess, throwing smoke from the exhaust. Even though I have the same slopes, I do not go to the same place every day even though I go the same roads, sometimes it locks itself at 100 degrees and normally it is 110, while it is locked at 100 degrees that day. However, no problems were found in the indicators. I need your help on how to solve this problem and where to start.

* Thermostat changed 2 times
* Green sender has changed
* When I pulled out the fan sensor, the 2-stage fan is working, but even when the vehicle is moving, I have never come across the 2nd stage of the fan, the air conditioner is already defective.
* Leak checks have been done, no leaks, the antifreeze is clean, I have the exhaust system checked, the last muffler has just changed, they said there was no problem other than that.

* Do you know a good master in Ankara where I can get his fan and general maintenance done?

There is also a blue-colored sender in my radiator just below the upper hose, what is the sender and there is a blue sender in a hose to the left of the vehicle. Because I think my fan is not the original, he opened the first stage in the 90s, I think this problem existed before. The fan sender I mentioned above is for your knowledge in brown.