Overheating issue
 

Hello guy I have a question my car says its over heating but i have changed the coolant tempeture sensor and sender ive changed the fan control module the radiator and hoses but whats weird is my car can sit all night and when i go outside the next day to go to work as soon as i start it it says its over heating sometimes when i drive it, it will go down and sometimes it just stays up and wont come down my coolant doesnt leak out or even get low at all oh and i changed the thermostat too. so right now im at a loss and confused as hell.

Please help and ive searched here alot and cant find out anything