Geo 1995 Prizm Owner's Manual page 215

Hydraulic Clutch
The hydraulic clutch linkage in your vehicle is
self-adjusting. The clutch master cylinder reservoir is
filled with hydraulic clutch fluid.
When to Check and What to Use
It isn't a good idea to "top off' your clutch fluid. Adding
fluid won't correct a leak.
A fluid loss in this system could indicate a problem.
Have the system inspected and repaired.
Refer to the Maintenance Schedule to determine how
often you should check the fluid level in your clutch
master cylinder reservoir and for the proper fluid. See
"Owner Checks and Services" and "Recommended
Fluids and Lubricants" in the Index.
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