Where is the water pump located on a 2004 Chevy impala?

On a 2004 Chevy Impala, the water pump is located at the front of the engine, near the timing cover. To be more precise, it's driven by the timing belt (or chain, depending on the engine type – the 3.4L and 3.8L engines of that year used a timing chain). You'll need to access it from the front of the vehicle, likely requiring removal of some components to get a clear view and access for replacement.