Where is the water pump located in a 1995 Chevy Astro Van?

The water pump on a 1995 Chevy Astro van is located at the front of the engine, on the driver's side. It's driven by the serpentine belt. To be more precise, it's typically near the bottom of the engine, but you'll need to consult a repair manual or diagrams specific to the engine your Astro has (4.3L V6 or 4.9L Inline 6 are the most common) to get the exact location. The access might be somewhat limited requiring removing some other components to fully see and access it.