Okay, I put antifreeze/coolant in the reservoir and the car started. The radiator fans now blow, which isn't something I've seen the fans do since I've had the car. However, the car heats up if I let it run for a while. Any particular reason that would be, or do I just need to wait?

note, I also have an existing vacuum leak that I know of. In the attached picture, the red tube going from the head to the intake isn't plugged into my intake or head. Would this cause a problem similar to causing the car to heat up?