cooling problem

Hi, I own a 91 accord LX cople of days ago it over heated for the first time in 4 years I looked under the hood and one of the hoses was leaking cooling fluid, I changed it and added more fluid and it worked fine for the day the next day i was sitting in a parking lot and i noticed that it is overheating again not to the red but over normal the hoses are not leaking and there is no smoke coming out of the mufller so I would think that the gaskit is not blown, bothe fans are working. Any ideas????? Thank you :)