Check to make sure your electric fan is running in front of the radiator while the ac is on and the car is hot, if it isn't that might be why it's getting a little hot. Anything between 80 and 100 should be ok for a normal temp, it should be safe a lot higher than that but if it stays over 100 then something isn't right.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k