Acc. Fan Coolant Temp

At what coolant temp is the acc. fan supposed to kick on?
It seems like I have to leave the A/C on to keep the temps down to 210....

215* to 218* is the temp the aux fan starts.Aux fan will cycle with the AC clutch when the AC or defrost is on.
If your overheating at a stop then the fan clutch may need to be replaced or the cooling system serviced.
Wayne