2001 Ford Explorer block heater

Hi again, I noticed a big coolant leak under the engine after a short drive, when I crawled under and looked it seems to be coming from the engine block where the the heater plug conects. My question is, If I remove the flat head screw I can see will the heater come right out? Is this repair simple like replacing the heater in a hot water tank? My manual does not show me anything about this type of repair, or if it can be repaird. I hope you can help, thank you.