Hi, have a 1997 Honda civic exi, has been heating up and drying up radiator on long...heats up above 110 km/h. Please suggest. The radiotor is ok. Could it be the cap, gaskit or anything. Makes a fizzy sound as well

 

Do a compression test, post the numbers, do a block test, and bleed your coolant.

 

Pressure test the cooling system for leaks.