How do you change the hydraulic fluid in a 1993 Saturn?

Hydraulic fluid could be used in two locations on your 1993 saturn. your brake system is of course Hydraulic, in this case, the easiest way to change the fluid is to obtain a vacuum brake bleeder kit from your local parts store. you will need to loosen each bleeder screw on all 4 wheels and attach the vacuum bleeder. keep an eye on the fluid level in the master cylinder so it doesnt get too low. 1 large bottle of brake fluid is enough to do an entire vehicle. If you are talking about the clutch fluid, which is also hydraulic, there is no method of changing the fluid. the unit is sealed and offers no bleeder.