i had to replace my heater hose cuz it had a hole in it and was leaking coolant but now when i have my car on the add coolant light is on and the buzzer gos off and its full all the way so i dont know why it is going off

 

clean the connector on top of the radiator.
unplug it, spray it with electronic contact cleaner, let it dry, and plug it back in
that solved it for me

 

You gotta purge the radiator of all the air bubbles still in it. lemme look fot the thread detailing this.

Edit* Here it is.
https://www.rx7club.com/2nd-gen-archive-72/filling-coolant-after-rebuild-383818/