I am also starting doing some preventative maintenance on the power steering fluid and the fan fluid. If I remember correctly there is nothing in the maintenance schedule about changing those fluids. So with each oil change now I am pumping out as much fluid as my hand pump will get out of the tanks and refilling with synthetic Mercon. At least I get some of the fluid out every 5000 miles and I suspect this will help the systems last longer. Overall it might be overkill, but maintenance is cheaper than a repair.
I also started that regime on my daughter's 2000. The old fluid was looking a little funky after only about 15K miles.