okay so i thought its time to bump this up,
installed a water temp gauge, and yes its still doing the hot/cold thing.
rice you mentioned a operating temp of 70oC, well in my case, its will rising to about 200degrees Fahrenheit at its hottest, so like 93 degrees.
its important to stress im running the factory 4ac clutch fan which sits apprix 70mm from the radiator.
where do you guys recommend from here?