* Sides of the engine block: These are the most common locations. You'll find them near the bottom of the block, often behind or partially obscured by components like the oil pan or exhaust manifolds. Access will usually require partially draining the coolant and possibly removing some components.
* Rear of the engine block: There may be one or more freeze plugs located on the back of the engine block, making access even more difficult.
You will *not* be able to see all of them without partially disassembling parts of the engine. A workshop manual specific to your 1995 Ford E-150 with the 4.9L engine is your best resource for precise locations. These manuals often include diagrams showing the freeze plug locations.
Important Note: Before attempting any work on your engine's freeze plugs, ensure the engine is completely cool. Working on a hot engine is dangerous. If you are not comfortable performing this repair yourself, take your van to a qualified mechanic. Replacing freeze plugs often requires specific tools and knowledge to avoid damaging the engine block.