Where is the cylinder 3 located on a 2004 ford freestar?

There's no Cylinder 3 in the way you might be thinking of it on a 2004 Ford Freestar. The Freestar uses a V6 engine, which means the cylinders are arranged in two banks of three, in a "V" shape. They are numbered sequentially, but not in a simple left-to-right order.

To find the location of what you're likely calling "cylinder 3," you need to consult a repair manual specific to your 2004 Ford Freestar's engine (likely a 3.9L or 4.2L Duratec V6). The manual will have diagrams showing the cylinder arrangement and numbering. Looking at the engine from the front, cylinder 3 will likely be on one side of the "V," but the exact position varies by engine orientation and the numbering scheme used by Ford.

Without a diagram, it's impossible to give a precise location.