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Wellll....my 2.5 behaved like that when I bought it 4 months ago. Temperatures would go up to 100C when idling or climbing a hill, especially after a highway run or a quick acceleration.
Turned out my fan clutch was bad. I installed a new one and this problem was gone.
Since then I also have replaced the coolant with Zerex G05 and Water Wetter.
Now, the engine rarely goes above 90C, mostly it stays between 80C and about 87C I'd estimate. This is in the summer too.
Running with the AC on will bump temperatures by 5C easy.
Highway cruising with AC off: 82-85C; AC on: about the same.
I went with a 40% Zerex mixture btw.
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