Zerotohundred

hello teacher n sifus,
mine is AE101 4afe, i just back from malacca yesterday n maintain speed at 140-160 km/h. When reached seremban, temp almost show the red line, so i stop my car, shock after 1/2 hour, i have to put 2 bottle of 1.2L water into the rediator..
Why? whats wrong a?
Already change water pump n no leaking,
Isnt caused of engine is so hot?
How to overcome it?

Thanx