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Will a leak cause air to get into the system? Today after it warmed up it blew antifreeze out of the radiator cap?

I have an 01 Cherokee the heater core leaks on the passenger side floor. I am wondering how difficult it is to change the core or if there is a quick way to seal up the leak. I have heard many horror stories about how much work goes into changing one. And how much it would cost to have someone...