Is this even a problem?

I noticed that the fan on my 01 XLS seems to be on all the time, I know it is a hot summer but it seems odd to me, and I have never notcied this before and I am sure it has to be hurting my MPG also. If it is abnormal what could be the problem/fix. Is it possible to recharge the AC freon with the cans of freon they sell? any help would be appericated, thank you

P.S. it has 98k mi on it.

Charging the A/C
You will need to buy a kit (guages, connectors, freon). Ask at the autoparts store.

The fan will stay on if you have the A/C on. Is the car running cooler than normal? Hotter than normal? Is the radiator free from debri, bugs?

Well I checked the fan with both the A/C on and off, the temp gauge seems to stay right where it is supposed to be, Thats kind of why I was wondering if it was normal or not, thanks for the help