GMC SIERRA 1994 Manual page 294

When the engine
compartment is
hot, the level
should be at the
FULL mark.
When the engine
compartment is
cool, the level
should be at the
FULL COLD
mark.
What to Add
Refer to the Maintenance Schedule to determine what kind of fluid to use.
See "Recommended Fluids and Lubricants" in the Index.
NOTICE:
When adding power steering fluid or making a complete fluid
change, always use the proper fluid. Failure to use the proper
fluid can cause leaks and damage hoses and seals.
Hydro-Boost Brake System (Hydraulic Pump)
The power steering pump is also used as the Hyrdo-boost pump. Refer to
"Power Steering System" in this section when checking fluid level or
adding tluid.
6-44