What is a frost plug?
Freeze plugs? These are holes in engine block that were required to "cast" the engine upon manufacture. Plugs were installed at the end of this process. These plugs are designed to "POP" out if the engine freezes due to lack of antifreeze. They can save the engine from requiring total replacement if this condition happens
I am assuming you mead the frost plugs on the engine block that will push out if the coolant is the block is too weak and the engine is exposed to terrible cold, long enough to freeze the block solid. Depending which freeze plug it is, (also called a frost plug) you might be lucky enough to not have to remove the engine from the vehicle. Regardless if the plug is completely out or not…
You need to drain the coolant, pry out the old frost plug and hammer in the new frost plug. Usually I just stick a screwdriver through the hole in the old one and pry it out. You might find that if you use a piece of wood or a seal driver it may go in easier as it has to be driven in straight (evenly).