drive pulley for cooling fan came apart

my car stopped cooling, and what I found is that the large pulley on the motor has come apart. The outer part just spins on the steel pulley. Is this bolted together or something I can easily repair? It is a 52,000 mile 2 door monza with new tires, little rust, and the paint is not too old,as the car is a pretty light blue. At this point I really need money to pay bills with and wish to sell it as well. As is. please let me know Thanks Mike j knapp mjkknapp@live.com