coil plugs?????????

looking at a cabby and in the ad it says

 "The car was a great reliable runner up until about 2 weeks ago when it was left without anti freeze and when started spat out the coil plugs in the engine. I had the belt replaced along with push flow sensor for the automatic choke, but the 3 hours of labour needed to get to the coil plugs was seen by my wife as to much hassel so thats unfort how it has stayed. This is the only reason for this car to be off the road, it still starts and drives but obviously with no water to cool it down heats up pretty quickly."

is it a hard fix??? really dont understand wots happened to it!!!

it should say core plug not coil plug. easy fix put another one in. Core plugs are convex metal discs used to seal round holes that are found in many castings. They are incorporated in the castings as part of their manufacturing process and are intended to allow the sand, used as a ?core?, to be removed from inside the casting.
 Unfortunately with time they tend to corrode, usually from the inside, and then leak. They can also be forced out in frosty weather if you have not filled your cooling system with anti-freeze!

That's why you will also hear them called freeze-out plugs, wrong name really but the idea is right. I would be most concerned by the seller saying, "…it still starts and drives but obviously with no water to cool it down heats up pretty quickly." Has he done this a few times? If so there could be damage due to the engine getting too hot.

ok cheers guys...