Where are the freeze plugs on a grand marquis?

Answer 1

They are all around the engine block. Several (usually three) on either side under the exhaust manifolds and usually one or two in the front on either side and the same in the back. They are round, flat circles somewhat resembling a jar or bottle lid made of steel or sometimes brass that are pressed into holes in the engine block. They are installed at the factory and designed to pop out in case your antifreeze fails and the water in your engine begins to expand. Without freeze plugs, your engine would crack, just like a glass bottle full of water in your freezer. If you've had a bad freeze they may pop out, but usually they fail due to rust. They are easiest to replace with the engine out of the vehicle but in some instances some of them can be replaced while still in the vehicle. I say some because you pretty much have to drive them in with a hammer, so it takes a bit of room to do the job. If you're unsure of your abilities, I'd recommend removing the engine with a rented engine hoist and going from there. While you have them all out, clean out the water jacket with some brushes and get the rust out. It builds up in the block restricting coolant flow and allows the engine to overheat. If you need a specific drawing of exactly where they are, I suggest looking in a junk yard or finding an engine diagram. Either way, good luck.