It got really cold out last night...-30 around. My husband started the car for work this morning..came in to let it warm up and we heard a loud POP come from outside near the car..well long story sort...there is alot of coolant on the ground and we think the freeze plug blew out or something. Does anyone know if they are hard to replace? I know they are cheap but I also know that sometimes they are in a bad spot on the engine and hard to install. It's a 93 buick roadmaster...a V8.