Beamz

Hello i know this is a topic that has many posts and also in the archives but i have tried many and still not much luck.
My car seems to run with the fans on and off very constantly. Even in cooler temps when the engine gets to operating temp it moves up on the temp dial just as frequent as in the hot weather and fans run on and off almost the same. in Hotter temps the fans bearly get a breather. I have changed the thermostat and also bleed the system many times. Is it noraml that it relies so heavily on the fans to keep the temp needle down?
Cheers from Downunder