If your radiator is old, it may not be working very well. Ditto for your water pump.
As mentioned, an electric fan creates a pretty major load on the electrical system. Also, a lot of electric fans don't move nearly the air that a flex fan does. Do you have room for a puller on the front?
If your car is an auto, moving to a separate tranny cooler may help some also.
Remember, water cools better than antifreeze, so maybe running less glycol in the summer would help too.
Steve