Could be yours has developed similar problem to what mine had, but not as pronounced --- a stuck thermostat, and luckily, it's stuck "open". That is, the water's flowing through the radiator even when it doesn't need to be (rather than the opposite, much worse situation, where it doesn't flow through the radiator ever, and just loops back to the engine with very little cooling going on)
i hardly ever saw over 80c in summer, usually just a bit over 70. in winter i'd struggle to keep it out of the "COLD" zone (that thick white vertical line bit that goes downwards from about 50-60 degrees), particularly if i did any kind of speed (over 35-40mph! on freezing cold nights coming back from bar work, when outside air was rushing toward double negatives, i'd do the entire trip in 2nd, little faster than a scooter, as changing up or accelerating meant both I and the engine began to grow icicles)
after replacing the thermostat, its sitting at a healthier 75-90 range depending on outside air and how it's driven. havent any summer figures for that really yet though, as i replaced the offending article last winter and haven't driven it in the sunshine since... but i know i still had to work to get the fan to kick in. Not like before, where it was a good ten minutes of sitting it at 3000rpm in neutral with still air*, but even with a working thermo it's not rushed to overheat.
*this was however when i was trying to keep my bod warm on a winter's trip, and wanted to see if i could actually get the fan to activate or not...
