What should I do about my summer job when college starts?

I started a front desk reception job at an aquatics school this summer. I initially told the managers when I was interviewing I was interested in working when I go back to school (ill be a freshman in college). This was because I was unsure if I was going to stay at home and commute or live on campus. I don t think I will be able to get a car so I ll most likely be living on campus. I really like this job and my coworkers/managers and would like to be able to work there during my winter/summer breaks. How do I tell my managers that I can t work during the school year, but would like to stay with them during the summer???