the other day while i was driving... the car suddenly overheated... went to a gas station to cool it down and put water in the radiator... decided to go home after (less than 1km from station)

the following day... i drove for less than 1km and it started to overheat already... brought it home right away

2 days after... i drove it to the repair shop to have it checked and fixed... it did not over heat (10km away)

the question is... what happened?

btw when i was overheating... coolant was coming out of the radiator cap