How do I change the thermostat?

And where is it? I think I have an idea but a pic would help any online manuals available?

Which engine?

V-6

#25500A in the following pic. If I remember right, the engine is on the passenger side, and transmission on the drivers side. Which means this should be on the drivers side of the engine, above the transmission.

http://208.8.111.88:8088/GROUP/NAS3809900/TIF/25-255A11.gif

John as always you are correct, as you look down and in over the radiator on drivers side the thermostat housing is right there facing the radiator (the radiator hose leading to the housing is also a give away).

Thanks to everyone who helped me on this issue.