the car sounds like it is still on after you turn it off.

why does it still do it also when your driving,the fan is also going

There are fans to regulate temperature for components just like your computer has.

it started to do this 2 weeks ago, with the fan,and i was wondering if i can do anything to repair it so it wont make that noise

As long as it doesn't cause any battery drain, if you feel more comfortable to have it checked for peace of mind, by all means have it checked.

thank you