How often should this be done? Is it just a drain and fill or an actual flush? If it is just a drain and fill, anyone have a website for instructions?
Thanks

 

you should be fine with just replacing the fluid. unless youve actually put on the wrong kind of fluid.
but if just for maint. reasons, you can use a turkey baster to draw out the fluid from the reservoir and refill after getting out all you can.
also, you should do the same for your brake fluid. both every couple years will keep things up and good.
chris

 

Power steering fluid doesnt go bad very often. Unless you are doing a lot of parallel parking, or hard autocrossing all summer, you shouldnt need to change it, except *maybe* once or twice per 100,000 miles. Even then you will be changing it more often than 95% of all fourth-gens on the road today.

GM's power steering system is very robust, and a simple dump of the fluid will do. Suck it out of the resovoir and top up. If you want to be really ****, disconnect the return hose, stick it into a bucket, then crank over the engine to relieve it all. Shut off the motor when it gurgles, which will probably happen within ten seconds. You wont hurt it as long as you dont rev the engine. I've done hundreds of pumps like that when I was working test lab at GM's power steering division back in the early nineties.