how do i no if the therostat ,sensor,or radiator could you help me.

Hey Brenda, It's nearly impossible to know what might be the cause without seeing the vehicle. My guess is that if it's happening after driving that you may have a cooling fan issue, but cant be sure. Do you have a shop you can take it to to get it checked out? What ever you do, don't let it overheat, that will make it a very expensive repair.