Let me start out by saying that I am in no way a mechanic and can perform the usual minor maintenance. Problem is the temp guage in my civic will go almost to the red on occasion, like long distance trips (+ 40 miles), then it wont do it for a while. The car isn't modified and its my daily drive, has new radiator and engine is in excellent shape with recent tune up. Any advice would be greatly appreciated. I just dont want it to over heat and cause some internal engine damage.
Thanks in advance

**update, flushed and bled the system. Heard a booiling noise near the radiator cap after driving so replaced cap. Still doing same thing. Also have not seen the fan turn on once, any ideas?
Thanks again