Yes, replacing the fan is easy. Maybe Pat is thinking of the heater core?
Anyways, watch out for the parts store replacements. Usually you have to cut your wiring connector off and splice it in, and the cage doesn't have the same number of blades so the air doesn't move as well. Speaking from experience on my old 9C1.
If you can get a good used one for 15 bucks, go for it!