1991 Dodge Dakota freeze plug

Yes! It would leak causing overheating. To remove the freeze plug using a hammer and a small screw driver. You want to use the handle end of the screwdriver on the freeze plug. If you use the business end of the screwdriver you could scratch or scar the block (which is very bad). You want to knock the plug sideways and then grab it with some pliers. Once removed, clean any signs of rtv or gasket sealant out of the hole. When cleaned real good, your ready to put in the new one. You'll need to smear a thin layer of gasket sealant (RTV, Blue stuff ect..) on both sealing surfaces of the block and plug. Then take a socket and extension that fits inside the new plug and tap it in nice and even. Make sure it goes in straight and is seated properly or it WILL leak again. You should also use a high quality sealant. It would be a shame to have to do it twice because of cheap sealant. Hope this helps you out.