A freeze plug is kinda like a metal cap that gets pressed into various strategically positioned holes around the engine. if your engine has water instead of anti-freeze during a freezing night it could cause the water to freeze and expand and pop a freeze plug out. they have to be pressed in. the actual freeze plugs themselves shouldn't cost more than about $20 the labor to install them will vary depending on how difficult they are to reach on your car. They are usually towards the bottom of the engine.
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