You must extract the freeze plug from the engine block, either using an extractor or a chisel, then clean the freeze plug seat of all debris and corrosion, then carefully install the new freeze plug using a wood block and mallet. Depending upon the location of the freeze plug, either adjacent components (exhaust pipes, starter, accessory brackets, etc.) must be removed for access. If the freeze plug is in a particularly difficult location, the engine may need to be removed from the car to service the freeze plug (in extreme circumstances).
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