Drain and properly dispose of the coolant. If the freeze plug is accessible, drive it sideways with a chisel without striking the block, then pull it out with pliers or locking pliers. Apply sealer to the new plug, start it evenly, and tap it in with a socket that fits inside, matching the depth of the other plugs.
The owner of a 1997 Buick LeSabre with about 97,783 miles asked whether an accessible freeze plug could be replaced at home and what tools were needed. The expert said accessible plugs are usually manageable: drain the coolant, turn the old plug sideways with a chisel, extract it with pliers, then install the new plug evenly with sealer and a fitting socket.
